1. 2S. Sakka, K. Kamiya; S. Somiya, and S. Saito pp. 101 -109, in Proceedings of International Symposium of Factors in Densification and Sintering of Oxide and Non-Oxide Ceramics Edited byToyko Institute of Technology, Tokyo, Japan, 1978 .
2. 3P.A. Badkar, J.E. Bailey, H. A. Barker, and G.C. Kucznski , pp. 311 -22, in Sintering and Related Phenomena, Materials Science Research, Vol. 6 Edited by, PlenumNew York, 1973 .
3. 4P. F. Becher, J. H. Somers, B.A. Bender, B.A. MacFarlane; H. Palmour, R. F. Davis, and T. Hare pp. 70 -86, in Processing of Crystalline Ceramics, Materials Science Research , Vol. 11 Edited by, Plenum. New York, 1978 .