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A.M. Gurevich, A.V. Terekhov, D.S. Kondrashev, A.V. Dolbin, D. Cassidy, G.E. Gadd, S. Moricca, and B. Sundqvist, Low-temperature heat capacity of fullerite C60 doped with nitrogen, Low Temp. Phys. 32, (2006) [Fiz. Nizk. Temp. 32, 1275-1277, (2006)] DOI: https://doi.org/10.1063/1.2364490.