Academic literature on the topic 'Apatite Mechanical properties'

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Journal articles on the topic "Apatite Mechanical properties"

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Takeuchi, Akari, Akinari Nakagawa, Shigeki Matsuya, and Ishikawa Kunio. "Effect of Added Tricalcium Phosphate on Basic Properties of Apatite Cement." Key Engineering Materials 361-363 (November 2007): 339–42. http://dx.doi.org/10.4028/www.scientific.net/kem.361-363.339.

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Effect of added α-tricalcium phosphate (α-TCP) and β-TCP was investigated to understand the setting reaction of apatite cement consisting of tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA). Addition of TCP delayed the initial setting time because TCP was not involved in the initial setting reaction and resulted in the decreased initial mechanical strength. After the initial setting of the cement due to the conversion of TTCP and DCPA into apatite, α-TCP dissolved to supply calcium and phosphate ions and they were consumed for crystal growth of apatite. Therefore, mechanical strength of the apatite cement containing α-TCP was increased. In contrast, added β-TCP showed no reactivity in the cement and thus result in the decreased mechanical strength.
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Artilia, Ira, Myrna Nurlatifah Zakaria, and Arief Cahyanto. "Setting Time, Handling Property and Mechanical Strength Evaluation of SCPC50 and Apatite Cement Mixture in Various Combinations." Key Engineering Materials 829 (December 2019): 40–45. http://dx.doi.org/10.4028/www.scientific.net/kem.829.40.

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Apatite cement is ideal self-setting cement for bone substitute material, however its use is limited only to areas that receive minimum load bearing because mechanical strength of apatite cement is low. Silica-calcium phosphate nanocomposite (SCPC50) is material having good mechanical strength and has an important role in bone remodeling (bone metabolism), mineralization, synthesis of cartilage, collagen production, proliferation and differentiation of bone cells. However, the unsetting and granule’s physical shape of SCPC50 limits the application. The purpose of this study is to determine the effect of various mixtures of SCPC50 and apatite cement to manipulative index (setting time and handling property), and mechanical properties. The experimental results show that the setting time of apatite cement mixture with 5% and 10% SCPC50 was 40% higher (p<0.05). The mechanical strength evaluated by Diametral Tensile Strength showed that the addition of both 5% silica and 10% SCPC50 composition to apatite cement mixture increased the mechanical strength of apatite cement mixture (p<0.1). The handling property of cement paste was significantly increased between the apatite cement without SCPC50 and apatite cement with both 5% SCPC50 and 10% SCPC50 (p<0.05). It is concluded that the addition of SCPC50 to apatite cement mixture could improve the mechanical properties and it is expected to improve its bioactivity.
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Roveri, Norberto, Elisa Battistella, Claudia Letizia Bianchi, Ismaela Foltran, Elisabetta Foresti, Michele Iafisco, Marco Lelli, Alberto Naldoni, Barbara Palazzo, and Lia Rimondini. "Surface Enamel Remineralization: Biomimetic Apatite Nanocrystals and Fluoride Ions Different Effects." Journal of Nanomaterials 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/746383.

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A new method for altered enamel surface remineralization has been proposed. To this aim carbonate-hydroxyapatite nanocrystals which mimic for composition, structure, nanodimensions, and morphology dentine apatite crystals and resemble closely natural apatite chemical-physical properties have been used. The results underline the differences induced by the use of fluoride ions and hydroxyapatite nanocrystals in contrasting the mechanical abrasions and acid attacks to which tooth enamel is exposed. Fluoride ions generate a surface modification of the natural enamel apatite crystals increasing their crystallinity degree and relative mechanical and acid resistance. On the other hand, the remineralization produced by carbonate-hydroxyapatite consists in a deposition of a new apatitic mineral into the eroded enamel surface scratches. A new biomimetic mineral coating, which progressively fills and shadows surface scratches, covers and safeguards the enamel structure by contrasting the acid and bacteria attacks.
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Okazaki, M., and H. Ohmae. "Mechanical and biological properties of apatite composite resins." Biomaterials 9, no. 4 (July 1988): 345—IN3. http://dx.doi.org/10.1016/0142-9612(88)90031-2.

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Zhang, Yu, Cui Huang, and Jiang Chang. "Ca-Doped mesoporous SiO2/dental resin composites with enhanced mechanical properties, bioactivity and antibacterial properties." Journal of Materials Chemistry B 6, no. 3 (2018): 477–86. http://dx.doi.org/10.1039/c7tb02864d.

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Roveri, Norberto, Elisa Battistella, Ismaela Foltran, Elisabetta Foresti, Michele Iafisco, Marco Lelli, Barbara Palazzo, and Lia Rimondini. "Synthetic Biomimetic Carbonate-Hydroxyapatite Nanocrystals for Enamel Remineralization." Advanced Materials Research 47-50 (June 2008): 821–24. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.821.

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New biomimetic carbonate-hydroxyapatite nanocrystals (CHA) have been designed and synthesized in order to obtain a remineralization of the altered enamel surfaces. Synthesized CHA mimic for composition, structure, nano dimension and morphology bone apatite crystals and their chemical-physical properties resemble closely those exhibited by enamel natural apatite. CHA can chemically bound themselves on the surface of natural enamel apatite thanks to their tailored biomimetic characteristics. The remineralization effect induced by CHA represents a real new deposition of carbonate-hydroxyapatite into the eroded enamel surface scratches forming a persistent biomimetic mineral coating, which covers and safeguards the enamel structure. The experimental results point out the possibility to use materials alternative to fluoride compounds which is commonly utilized to contrast the mechanical abrasions and acid attacks. The apatitic synthetic coating is less crystalline than enamel natural apatite, but consists of a new biomimetic apatitic mineral deposition which progressively fills the surface scratches. Therefore the application of biomimetic CHA may be considered an innovative approach to contrast the acid and bacteria attacks.
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Ibrahim, Nurul Farhana, Hasmaliza Mohamad, Siti Noor Fazliah Mohd Noor, and Nurazreena Ahmad. "Mechanical Properties of Hydroxyapatite Reinforced 45S5." Solid State Phenomena 264 (September 2017): 29–32. http://dx.doi.org/10.4028/www.scientific.net/ssp.264.29.

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Hydroxyapatite (HA) has similar constituent with natural bone mineral and is able to evoke apatite formation on the bone interface. Similarly, bioactive glass (BG) such as 45S5 has the ability to induce bone formation when exposed to physiological environment. However, both materials have drawbacks in mechanical properties such as brittleness and low compressive strength. Hence, HA-BG composite has potential for enhance properties. The current work aims to assess the effects of BG addition in HA system focusing on mechanical properties.
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Eskandari, A., M. Aminzare, H. Hassani, H. Barounian, S. Hesaraki, and S. K. Sadrnezhaad. "Densification Behavior and Mechanical Properties of Biomimetic Apatite Nanocrystals." Current Nanoscience 7, no. 5 (October 1, 2011): 776–80. http://dx.doi.org/10.2174/157341311797483646.

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HISAMORI, Noriyuki, and Yukito HAGIHARA. "503 Evaluation of Mechanical Properties of Apatite Ceramics Composite." Proceedings of the 1992 Annual Meeting of JSME/MMD 2005 (2005): 331–32. http://dx.doi.org/10.1299/jsmezairiki.2005.0_331.

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Leshkivich, K. S., and E. A. Monroe. "Synthetic silicate sulphate apatite: mechanical properties and biocompatibility testing." Journal of Materials Science: Materials in Medicine 4, no. 1 (January 1993): 86–94. http://dx.doi.org/10.1007/bf00122984.

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Dissertations / Theses on the topic "Apatite Mechanical properties"

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Vakifahmetoglu, Cekdar. "Production And Properties Of Glass Bonded Apatite-wollastonite Bioceramics." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605852/index.pdf.

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Apatite containing bioceramic materials are considered to be potentially useful for replacement or repair of natural bone. In the present study, the aim was to produce a new composite bioceramic containing crystalline apatite and wollastonite phases with a bimodal grain size distribution. The manufacturing scheme was based on the liquid phase sintering process in which the compacts pressed from powders of apatite (HAP or Si­
HAP) and pseudowollastonite was sintered in the presence of a liquid phase. Three distinct fluxing agents, magnesium flux (MCAS), sodium feldspar and sodium frit (NCAS), were prepared to act as additives for generating the liquid phase during sintering. Among those, the use of sodium frit resulted in the expected bimodal microstructural assembly. During the sintering studies, it was discovered that the apatite component of the ceramic was prone to compositional modifications by reaction with the liquid phase. This interaction resulted in a formation of siliconized HAP which crystallized in the form of rod-like grains. Meanwhile wollastonite grains tended to exhibit faceted equiaxed morphology and bonded to rod-like apatite grains with the help of a glassy phase. The results showed significant enhancement in the mechanical properties of apatite-wollastonite composites compared to phase pure hydroxyapatite. For example, the sample with 47.5 wt% Si-HAP2 + 47.5 wt% W + 5 wt% NCASfrit had the highest value of flexural strength, 83.6 MPa, which was almost twice that of hydroxyapatite, 46.3 MPa. The results for other properties such as compressive strength, hardness and fracture toughness also demonstrated the benefit of apatite-wollastonite composite approach.
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FANCIO, ELIZABETH. "Analise das transformacoes de fase da hidroxiapatita em temperaturas altas por difracao de raios X com aplicacao do metodo de Rietveld." reponame:Repositório Institucional do IPEN, 2005. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11265.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
FAPESP:00/05863-7
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Book chapters on the topic "Apatite Mechanical properties"

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Roddy, Edward, and Michael Doherty. "Crystal-related arthropathies." In Oxford Textbook of Medicine, edited by Richard A. Watts, 4482–94. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0451.

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Many crystals have been associated with arthropathies or periarticular syndromes: only monosodium urate (gout), calcium pyrophosphate (acute calcium pyrophosphate crystal arthritis, chondrocalcinosis), and basic calcium phosphates (mainly hydroxyapatite) are common. Crystals implicated in joint disease are stable, hard particles that exert biological effects via surface-active (activation of humoral and cell-derived mediators, interaction with cell membranes) and mechanical properties. In general, smaller particle size, marked surface irregularity, and high negative surface charge correlate with inflammatory potential. A ‘crystal deposition disease’ is defined as a pathological condition associated with mineral deposits that contribute directly to the pathology. This is probably the situation for all manifestations of gout, for acute syndromes associated with calcium pyrophosphate, and for acute apatite periarthritis.
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Prakash, Chander, Sunpreet Singh, Ahmad Majdi Abdul-Rani, M. S. Uddin, B. S. Pabla, and Sanjeev Puri. "Spark Plasma Sintering of Mg-Zn-Mn-Si-HA Alloy for Bone Fixation Devices." In Handbook of Research on Green Engineering Techniques for Modern Manufacturing, 282–95. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5445-5.ch015.

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In this chapter, low elastic modulus porous Mg-Zn-Mn-(Si, HA) alloy was fabricated by mechanical alloying and spark plasma sintering technique. The microstructure, topography, elemental, and chemical composition of the as-sintered bio-composite were characterized by optical microscope, FE-SEM, EDS, and XRD technique. The mechanical properties such as hardness and elastic modulus were determined by nanoindentation technique. The as-sintered bio-composites show low ductility due to the presence of Si, Ca, and Zn elements. The presence of Mg matrix was observed as primary grain and the presence of coarse Mg2Si, Zn, and CaMg as a secondary grain boundary. EDS spectrum and XRD pattern confirms the formation of intermetallic biocompatible phases in the sintered compact, which is beneficial to form apatite and improved the bioactivity of the alloy for osseointegration. The lowest elastic modulus of 28 GPa was measured. Moreover, the as-sintered bio-composites has high corrosion resistance and corrosion rate of the Mg was decreased by the addition of HA and Si element.
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Dabbarh, Fouad, Noureddin Elbakali-Kassimi, and Mohammed Berrada. "Chitosan Based Biocomposites for Hard Tissue Engineering." In Chitin and Chitosan - Physicochemical Properties and Industrial Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98468.

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Bone is the second most transplanted organ, just after blood. It provides structural support, protection for organs and soft tissues. It holds some critical biological processes such as the bone marrow blood forming system. It is responsible for storing and supplying minerals such calcium and phosphate. Bone is a connective tissue formed by two predominant phases: an inorganic phase containing mainly apatitic calcium and phosphate and an organic phase made of fibrous type I collagen. This natural biocomposite has many biological features such osteoconductivity, osteoinductivity, osteogenicity and is subject to a continuous remodeling process through osteoclastic and osteoblastic activities. In biomedical engineering, the restoration of damaged hard tissue with autologous bone is not always possible or even the best option. The development of some safe and low-cost alternatives such as biocomposites that mimic organic and calcified bone materials have shown very good results and offer an alternative to autologous bone implants. However, the mechanical properties of biocomposites still present a big challenge as a hard tissue substitute. This chapter reviews the properties of bone substitute materials chitosan and calcium phosphates, discusses strategies used in the treatment of calcified hard tissues as well as new approaches developed in this field.
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Conference papers on the topic "Apatite Mechanical properties"

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Kang, Y. X., Y. Bai, C. G. Bao, W. Fan, and L. Zhang. "Mechanical Properties and CMAS Corrosion Resistance of La2Ce2O7/YSZ Composite Thermal Barrier Coatings." In ITSC2018, edited by F. Azarmi, K. Balani, H. Li, T. Eden, K. Shinoda, T. Hussain, F. L. Toma, Y. C. Lau, and J. Veilleux. ASM International, 2018. http://dx.doi.org/10.31399/asm.cp.itsc2018p0075.

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Abstract 50 vol. % La2Ce2O7 (LC)/yttria partially stabilized zirconia (YSZ) composite thermal barrier coating (TBC) was deposited by supersonic atmospheric plasma spraying (SAPS). The mixture of LC and YSZ can effectively eliminate the sudden decrease of thermal expansions coefficients of LC. The results of CMAS corrosion tests indicated that the LC/YSZ composite coating reveals high resistance to the penetration of CMAS with reprecipitation of La-Ce apatite, CaAl2Si2O8, MgAl2O4 and t-ZrO2. Furthermore, compared to YSZ coating, the LC/YSZ composite coating can obviously improve the thermal cycling lives under CMAS corrosion.
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Saremi, Mohsen, and Nasim Kavusi. "Microstructure and mechanical properties of Mg-nano/micro hydroxy apatite composites made by powder metallurgy method." In THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019). Author(s), 2017. http://dx.doi.org/10.1063/1.5008248.

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Bouyge, Frederic, and Iwona Jasiuk. "Multiscale Analysis of Trabecular Bone." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1194.

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Abstract Bone has a complex hierarchical structure. We study trabecular bone as a multi-scale material. In particular, we distinguish the following scales: nanostructural (collagen fibrils and apatite crystals), microscale (single laminae and laminated structure), mesoscale (random network of struts), and macroscale. We first present experimental observations and an overview of existing theoretical models of bone. Then, we construct a hierarchical model to predict elastic properties of trabecular bone.
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Xiao, K., J. A. Dyson, K. W. Dalgarno, P. Genever, D. J. Wood, R. D. Goodridge, and C. Ohtsuki. "Manufacture and Characterisation of Bioceramic Tissue Engineering Scaffolds Produced by Selective Laser Sintering." In ASME 2007 International Manufacturing Science and Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/msec2007-31031.

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Currently there is no adequate bone replacement available that combines a long implant life with complete integration and appropriate mechanical properties. This paper reports on the use of human mesenchymal stem cells (MSCs) to populate porous bioceramic scaffolds produced by selective laser sintering (SLS) to create bespoke bioactive bone replacement structures. Apatite-wollastonite glass ceramic was chosen for use in this study because of its combination of excellent mechanical and biological properties, and has been processed using an indirect SLS approach. Process maps have been developed to identify process conditions for the SLS stage of manufacture and an optimised furnace cycle for the material has been developed to ensure that the required material phases for bioactivity are present in the manufactured scaffold. Results from tissue culture with the MSC’s on the scaffolds (using confocal and scanning electron microscopy) show that MSCs adhere, spread and retain viability on the surface, and penetrate into the pores of apatite wollastonite (A-W) glass ceramic scaffolds over a 21 day culture period. The MSC’s also show strong indications of osteogenesis, indicating that the MSC’s are differentiating to osteoblasts. These results indicate good biocompatibility and osteo supportive capacity of SLS generated A-W scaffolds and excellent potential in bone replacement applications.
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Ding, C. "Progress in Plasma Sprayed Bioceramic Coatings." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0401.

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Abstract Plasma sprayed hydroxyapatite coating can bond to living bony tissue, and it is being widely used in clinical application. The problem of hydroxyapatite coating on metal substrate may mainly come from the instability of coating-substrate interface and the unstable duration of coating in the presence of body fluid. Therefore, it is desirable to develop newly bioactive coatings with good bioactivity and mechanical properties. In this paper, new progress in plasma sprayed bioactive coatings at Shanghai Institute of Ceramics are reviewed. The novel coatings including wollastonite, dicalcium silicate, diopside and titania were deposited. All the bioactive coatings mentioned above form a bone-like apatite layer on their surface immersed in simulated body fluid, indicating their good bioactivity. The formation of bone-like apatite is induced by Si-OH and Ti-OH on the surface of coatings. The results of cell culture test indicated that novel coatings can enhance osteoblast adhesion, proliferation and differentiation, indicating their good biocompatibility.
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Monsalve, M., H. Ageorges, E. López, F. Vargas, and F. Bolívar. "Bioactive Glass Coatings Manufactured by Plasma Spraying from 31SiO2-11P2O5-(58-x) CaO- X MgO Powders." In ITSC2015, edited by A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen, and C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p0925.

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Abstract In this study, bioactive glass powders were synthesized from four different types of oxides (SiO2, P2O5, CaO and MgO). These oxides were mixed, melted, milled and sieved to produce powders with two chemical compositions of the 31SiO2-11P2O5-(58-x)CaO-xMgO system. The powders were plasma sprayed onto AISI 316L stainless steel and Ti6Al4V titanium alloy substrates using a F4MB Sulzer Metco gun. The physical and mechanical properties of coatings, as well as their bioactivity were evaluated. The bioactivity tests were carried out exposing the surface of coatings to simulated body fluid (SBF) during 1, 9 and 15 days. The thickness and hardness of apatite layer produced on the surface of each coating during bioactivity tests were evaluated. The results indicate that the thickness of apatite layer formed during 15 days in SBF is between 31 and 51 µm and its hardness is between 1.5 and 1.9 GPa according to the chemical composition of feed stock powder used to manufacture the coatings. Additionally, the harness of bioglass coatings decreased around 26% after to expose them to SBF.
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Rasool, Tabinda, Syed Rehan Ahmed, Iqra Ather, Madeeha Sadia, Rashid Khan, and Ali Raza Jafri. "Synthesis and Characterization of Hydroxyapatite Using Egg-Shell." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51933.

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Advancement in materials science and manufacturing processes helps in expanding the application span of materials in biotechnology. The technological development of biocompatible materials aids in improving health conditions, cancerous treatment, organ implants, and as well as provides several techniques to patient treatment. Hydroxyapatite (HAP) is considered as a potential material for orthopedics and dental implants due to its eminent biocompatibility and natural apatite characteristics. It is regarded as viable and cost effective solution of many biomedical applications. Major challenges in expanding the application span of HAP include obtaining optimum mechanical, chemical, and biological properties simultaneously while making its manufacturing processes cost effective. The main purpose of the current work is to synthesize and characterize high strength HAP with high degree of crystallinity and purity, which could be able to fulfill the requirements of modern biological materials. In this work, egg-shell which is considered as garbage is utilized as calcium source to synthesize HAP. Initially, egg-shells are properly cleaned with distilled water and dried. Ball milling operation is used to produce egg-shell particles of nano to micron range. The particles then mixed with controlled amount of phosphoric acid. The mixture is then sintered by heat treating at 900°C for 2 hours. The heat treatment (sintering) process is used to enhance the density as well as strength of egg-shell material. After synthesis of HAP, it is characterized through X-ray diffraction, scanning electron microscopy, and laser particle analyzer. Composition of HAP is investigated through XRD. Furthermore, surface topography of nano-crystalline HAP powder is measured through Scanning Electron Microscope while particle size distribution is found through laser particle analyzer. It is found that the addition of phosphoric acid in milled egg-shell and heat treatment give rise HAP in the sample. In addition, particle size varies from hundreds of nanometers to several micrometers. The results and analysis of the current work may provide insight of different properties which may lead to the development of optimum and cost effective HAP material. The current study could be further extended in increasing application envelop of biocompatible materials.
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