34. J. S. Cho, D. S. Yoo, Y. C. Chung, S. H. Rhee, Enhanced bioactivity and osteoconductivity of hydroxyapatite through chloride substitution. Journal of Biomedical Materials Research Part A
33. J. S. Cho, D. S. Yoo, Y. C. Chung, S. H. Rhee, Enhanced osteoconductivity of sodium-substituted hydroxyapatite by system instability. Journal of Biomedical Materials Research Part B: Applied Biomaterials