Julien T. Schirlin, Derek A. Wann, Simon F. Bone, Heather E. Robertson and David W.H. Rankin, Additivity of ring geometry distortion effects in unsaturated five-membered heterocyclic rings, Journal of Molecular Structure, Vol. 922 (2009) pp. 103-108
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http://dx.doi.org/10.1016/j.molstruc.2009.01.032