1. A.H. Heuer and L.W. Hobbs (eds.), Science and Technology of Zirconia, in Advances in Ceramis, Vol. 3, American Ceramic Society, Columbus, Oh, 1981.
2. N. Claussen, M. Rühle and A.H. Heuer (eds.), Science and Technology of Zirconia II, in Advances in Ceramics, Vol. 12, American Ceramic Society, Columbus, OH, 1984.
3. M. Riihle and A.H. Heuer, p. 14 ff in ref. 2
4. A.H. Heuer, N. Claussen, W.M. Kriven and M. Rühle, J. Am. Ceram. Soc., 65 (1982) 642.
5. A.H. Heuer and M. Riihle, to be published in Acta Met.