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Poutsma, J.C.; Upshaw, S.D.; Squires, R.R.; Wenthold, P.G., Absolute heat of formation and singlet-triplet splitting for HCCN, J. Phys. Chem. A, 2002, 106, 6, 1067-1073, https://doi.org/10.1021/jp013653q . [all data]