1. R. Stevens, “Zirconia and zirconia ceramics”, Magnesium Elektron Ltd, July 1986.
2. J. D. Hancock, Min. Sci. Eng.
9 (1) (1977) 25.
3. Humphreys Corporation, Brit. Pat. 1389 585, April 1975.
4. R. Stevens, in “Proceedings of the first European Symposium on Engineerings Ceramics” 25–26 February, London (1985) pp. 97–110.
5. U. O. Igiehon, Thesis, D Phil, University of London, Imperial College of Science, Technology and Medicine, November 1989.