Galtsov, N.; Prokhvatilov, A.; Dolgova, G.; Cassidy, D.; Gadd, G.; Moricca, S.; Sundqvist, B. Intercalation of Fullerite C₆₀ With N₂ Molecules. An Investigation by X-Ray Powder Diffraction. Fiz. Nizk. Temp. 2007, 33, 1159-1165.