A.V. Dolbin, V.B. Esel`son, V.G. Gavrilko, V.G. Manzhelii, S.N. Popov, N.A. Vinnikov, and B. Sundqvist, The low-temperature radial thermal expansion of single-walled carbon nanotube bundles saturated with nitrogen, Low Temp. Phys. 36, (2010) [Fiz. Nizk. Temp. 36, 465-469, (2010)] DOI: https://doi.org/10.1063/1.3432241.