1. Garvie, R. C., Hannik, R. H. J. and Pascoe, R. T., Ceramic steel?, Nature (London), 258 (1975) 5537.
2. Stevens, R., An introduction to zirconia, 2nd edn, Magnesium Elecktron Publication No. 113, Magnesium Elecktron Inc., New Jersey, 1986.
3. Heuer, A A. and Hobbs, L. W., Advances in ceramics, Vol. 3, Science and technology of zirconia, The American Ceramic Society, Ohio, 1981.
4. Claussen, N., Rühle, M. and Heuer, A A., Advances in ceramics, Vol. 12, Science and technology of zirconia II, The American Ceramic Society, Ohio, 1983.
5. Somiya, S., Yamamoto, N. and Hanagida, H., Advances in Ceramics, Vol. 24, Science and technology of zirconia III, The American Ceramic Society, Ohio, 1988.