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Torsional motion of the CH3 groups of propane studied by Raman overtone spectroscopy
Chemical Physics, Volume 144, Issue 1, 15 June 1990, Pages 81-92
R. Engeln, J. Reuss, D. Consalvo, J. W. I. Van Bladel, A. Van Der Avoird and V. Pavlov-Verevkin
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http://dx.doi.org/10.1016/0301-0104(90)80073-7
