1. S. Yajima, K. Okamura, J. Hayashi and M. Omori, J. Amer. Ceram. Soc. 59 (1976) 324.
2. Yang Deming, Cheng Anming and Zhang Zhiming, ISCMS Abstracts of Papers for Work-in-Progress, Beijing, China (1986) p. 45.
3. Y. Imai, Y. Tanaka, H. Ichikawa and T. Ishikawa, Tetsu-To-Hagane 76 (1990) 65 (in Japanese).
4. Idem, ibid., Y. Tanaka, H. Ichikawa and T. Ishikawa, Tetsu-To-Hagane 75 (1989) 1555 (in Japanese).
5. Yang Yiming, Liu Xinwei, Yang Shujin, Tan Zhilie, Lu Yi and Feng Chunxiang, in Proceedings of the 1st Japan International SAMPE Symposium, 29 November?9 December 1989, edited by N. Igata et al., p. 918.