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2. 3) G.Yamada : Tetsu-to-Hagané, 4 (1918), 348.
3. 4) S. Yagi : Seitetsu Kenkyu, No. 145 (1935), 103-116.
4. 8) Phase Diagrams for Ceramists, Vol. I, ed. by E.M.Levin, C.R.Robbins and H.F.McMurdie, coppiled at the National Bureau of Standards, Amer. Ceram. Soc., Ohio, (1964), 60.
5. 11) Phase Diagrams for Ceramists, Vol. I, ed. by E.M.Levin, C.R.Robbins and H.F.McMurdie, coppiled at the National Bureau of Standards, Amer. Ceram. Soc., Ohio, (1964), 219.