M. M. Maior, B. M. Koperles, B. A. Savchenko, M. I. Gurzan, O. V. Morozova, N. F. Korda, “Specific heat and thermal expansion of $\mathrm{Sn}_{2}\mathrm{P}_{2}(\mathrm{Se}_{x}\mathrm{S}_{1-x})_{6}$ crystals at phase transitions”, Fizika Tverdogo Tela, 25:1 (1983), 214–223
