1. A. Unsworth, M. J. Pearcy, E. F. T. White and G. White, Engng. Med. 17, (1988) 101.
2. D. D. Auger, J. B. Medley, J. Fisher and D. Dowson, Proceedings of the 16th Leeds-Lyon Symposium on Tribology, Leeds 1992, ?Mechanics of Coatings?, edited by D. Dowson, C. M. Taylor and M. Godet (Elsevier, Amsterdam, 1990), p. 264.
3. M. Oka, T. Noguchi, P. Kumar, K. Ikeuchi, T. Yamamuro, S. H. Hyon and Y. Ikada, Clin. Mater. 6 (1990) 361.
4. D. D. Auger, D. Dowson and J. Fisher, Proceedings of the 8th Meeting of European Society of Biomechanics, Rome. (1992), p.115.
5. Z. M. Jin, D. Dowson and J. Fisher, Wear 162 (1993) 627.