1. Katayama, I., Watanabe, Y., Kozuka, Z.: Trans. Jpn. Inst. Met. 20 (1979) 593.
2. Tretyakov, Yu.D.: Thermodynamics of ferrites; Leningrad: Chem. Publ. 1967, p. 164.
3. Paladino, A.E.: J. Am. Ceram. Soc. 42 (1959) 158.
4. Subramanyan, K.N., Khare, L.R.: Acta Crystallogr. B 35 (1979) 269.
5. Bich, V.M., Dobrovinskii, R.Y., Men, A.N., Orlov, G.I.: Zh. Fiz. Khim. 51 (1977) 3032.