2Afshar, A., Ghorbani, M., Ehsani, N., Saeri, M. R., & Sorrell, C. C. (2003). Some important factors in the wet precipitation process of hydroxyapatite. Materials & Design, 24, 197-202.
3An, G.-H., Wang, H.-J., Kim, B.-H., Jeong, Y.-G., & Choa, Y.-H, (2007). Fabrication and characterization of a hydroxyapatite nanopowder by ultrasonic spray pyrolysis with salt-assisted decomposition. Materials Science and Engineering A, 449-451, 821-824.
4Azaroff, L. A. (1968). Elements of X-ray crystallography. New York: McGraw-Hill., pp. 38-42.
5Bigi, A., Boanini, E., & Rubini, K. (2004). Hydroxyapatite gels and nanocrystals prepared through a sol-gel process.Journal of Solid State Chemistry, 177, 3092-3098.
6Chen, H. F., Clarkson, B. H., Sun, K., & Mansfield,J. F. (2005). Self-assembly of synthetic hydroxyapatite nanorods into an enamel prism-like structure.Journal of Colloid and Interface Sdence, 288, 07-103.
7Cuisinier, F., & Robinson, C. (2007). The structure of teeth: Human enamel crystal structure. In M. Epple, & E. Baeuerlein (Eds.), Handbook of biomineralization: Medical and clinical aspects (pp. 177-182).Weinheim: Wiley-VCH.
8Dart, J. A., Guo, Z. X., Raman, V., Bououdina, M., & Rehman, I. U. (2004). Metal organic chemical vapour deposition (MOCVD) of bone mineral like carbonated hydroxyapatite coatings. Chemical Communications, (6), 696-697.
9Emerson, W. H., & Fischer, E. E. (1962). The infrared absorption spectra of carbonate in calcified tissues. Archives of Oral Biology, 7, 671-683.
10Elliot, J. C. (1994). Structure and chemistry of the apatites and other calcium orthophos- phates. Amsterdam: Elsevier.
