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2 matching references were found.
Champion, J.P.; Hilico, J.C.; Brown, L.R., The vibrational ground state of carbon-12- and carbon-13-labelled methane, J. Mol. Spectrosc., 1989, 133, 244. [all data]
Champion, J.P.; Robiette, A.G.; Mills, I.M.; Graner, G., J. Mol. Spectrosc., 1982, 96, 422. [all data]