M.I. Bagatskii, V.V. Sumarokov, A.V. Dolbin, and B. Sundqvist, Low-temperature heat capacity of fullerite C₆₀ doped with deuteromethane, Low Temp. Phys. 38, (2011) [Fiz. Nizk. Temp. 38, 87-94, (2011)] DOI: https://doi.org/10.1063/1.3677237.