I. Ya. Minchina, V. G. Manzhelii, M. I. Bagatskii, O. V. Sklyar, D. A. Mashchenko, and M. A. Pokhodenko, Heat capacity of methane-krypton solid solutions. Conversion effect, Low Temp. Phys. 27, (2001) [Fiz. Nizk. Temp. 27, 773-779, (2001)] DOI: https://doi.org/10.1063/1.1388422.