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Allinger, N.L.; Conia, J.M.; Ripoll, J.L.; Tushaus, L.A.; Neuman, C.L., Conformational Analysis. XXXVI. Some Consequences of the Nonplanarity of Cyclobutane and Cyclopenanone Rings, J. Am. Chem. Soc., 1962, 84, 4982-3. [all data]