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Agapito, F.; Nunes, P.A.; Cabral, B.J.C.; dos Santos, R.A.B.; Simoes, J.A.M., Energetic differences between the five- and six-membered ring hydrocarbons: Strain energies in the parent and radical molecules, J. Org. Chem., 2008, 73, 16, 6213-6223, https://doi.org/10.1021/jo800690m . [all data]