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2. C. WAYMAN, inibid. ? p. 4371.
3. L. S. CASTLEMAN and S. M. MOTZKIN, in ?Biocompatibility of Clinical Impant Materials?, edited by D. Williams (CRC Press, Florida, 1981) p. 129.
4. D. H. R. JENKINS,J. Bone J. Surg. 60B (1978) 520.
5. D. H. R. JENKINS, I. W. FORESTER, B. MCKIBBINS and Z. A. RALIS, ibid.59B (1977) 53.