Syvokon V. Е. and S. S. Sokolov, Collective oscillations of systems of Xe atoms in a groove between two carbon nanotubes, Low Temp. Phys. 49, 1148–1162, (2023) [Fiz. Nyzk. Temp. 49, 1263−1278, (2023)] DOI: https://doi.org/10.1063/10.0020869.