1. and paper presented at the Engineering Foundation. Conference on Engineering in Medicine-Bioceramics, New England College, Henniker, New Hampshire, August 3-7, 1970,
2. and to be published in Engineering in Medicine?Bioceramics (edited by C. W. Hall, M.D., and S. F. Hulbert, Ph.D.).
3. in ?Chemistry and Physics of Carbon,? Ed., Vol. 5, p. 1, Dekker, New York (1969).