1. H. AOKI. in ?Science and medical application of hydroxyapatite?, edited by H. AOKI (Japanese Association of Apatite Science, Tokyo, 1991) p. 101.
2. S. FUJIWARA, M. YOSIMURA, T. HATTORI, H. AOKI, M. UCHIDA and S. SOMIYA. Yogyo-Kyokai-Shi 95 (1987) 753.
3. K. IOKU, S. SOMIYA and M. YOSIMURA. J. Ceram. Soc. Jpn. 96 (1988) 109.
4. H. AOKI, M. KIKUCHI, S. OKAYAMA, M. OHGAKI, M. AKAO, R. OTSUKA, M. KAKIHANA, M. YOSHIMURA and M. HIGASHIKATA. Reports Inst. Med. Dent. Eng. 26 (1992) 23.
5. C. M. MüLLER-MAI, C. VOIGT and U. GROSS. Scanning Microscopy 4 (1990) 613.