1. Gordon P.: Principles of phase diagrams in material system. McGraw-Hill, New York, 1968, p. 46–107.
2. Šesták J.: Thermophysical Properties of Solids. Elsevier, Amsterdam, 1984, chap. 10.5.
3. Cherepanova T. A.:in Rost kristallov, Vol. 13. Nauka, Moscow, 1980, p. 143 (in Russian).
4. Pfeiffer H., Haubenreisser W.: Phys. Status Solidi B101 (1980) 253.
5. Pfeiffer H.: Phys. Status Solidi a72 (1982) 239.