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A.V. Dolbin, V.B. Esel`son, V.G. Gavrilko, V.G. Manzhelii, S.N. Popov, N.A. Vinnikov, and B. Sundqvist, The effect of sorbed hydrogen on low temperature radial thermal expansion of single-walled carbon nanotube bundles, Low Temp. Phys. 35, (2009) [Fiz. Nizk. Temp. 35, 1209-1214, (2009)] DOI: https://doi.org/10.1063/1.3274811.