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Durig, J.R.; Church, J.S.; Compton, D.A.C., Low Frequency Vibrational Spectra and Internal Rotation of 2-Chloro- buta-1,3-diene, Propenoyl Fluoride and Propenoyl Chloride, J. Chem. Phys., 1979, 71, 1175. [all data]