M. Bagatskii, V. Manzhelii, V. Sumarokov, A. Dolbin, M. Barabashko, і B. Sundqvist, «Low-temperature dynamics of matrix isolated methane molecules in fullerite C₆₀. The heat capacity, isotope effects», Fiz. Nizk. Temp., вип. 40, вип. 8, с. 873–880, Чер 2014.