1. P.D. Garn, J. Thermal. Anal, 7 (1975) 475
2. V.M. Gorbatchev, ibid 8 (1975) 588
3. J. Pysiak, B. Sabalski and T. Zmijevski, in “Thermal Analysis” (4th ICTA), Vol. 1, p. 205, Budapest 1975;
4. J. Pysiak, B. Sabalski and T. Zmijevski, Rozc. Chem. 54 (1971) 263
5. J. Zsako, J. Thermal. Anal. 8 (1975) 593