1. 1) Koichi Kitazawa: Kinousei ceramic no sekkei, Gakkai Shuppan Center, (1984), p. 179.
2. 2) Gyozo Toda: Ceramic zairyo gijutsu shuusei, Sangyo Gijutsu Center, (1979), p. 406.
3. 3) R. L. Coble: U.S. Pat. 3026210, (1962).
4. 4) N. Grimm, G. E. Scott and J. D. Sibold: Ceram. Bull., 50 (1971), 962.
5. 5) W. D. Kingery, H. K. Bowen and D. R. Uhlmann: Ceramic Zairyo Kagaku Nyuumon Ouyohen, Uchida Rokakuho, (1980), p. 762.