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Tang, S.-J.; Chou, Y.-C.; Lin, J.J.; Hsu, Y.-C., The bending vibrational levels of the acetylene cation: A case study of the Renner-Teller effect in a molecule with two degenerate bending vibrations, J. Chem. Phys., 2006, 125, 13, 133201, https://doi.org/10.1063/1.2199827 . [all data]