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A.V. Dolbin, V.B. Esel`son, V.G. Gavrilko, V.G. Manzhelii, N.A. Vinnikov, S.N. Popov, and B. Sundqvist, Quantum effects in the radial thermal expansion of bundles of single-walled carbon nanotubes doped with 4He, Low Temp. Phys. 36, (2010) [Fiz. Nizk. Temp. 36, 797-799, (2010)] DOI: https://doi.org/10.1063/1.3479333.