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Frey, H.M.; Marshall, D.C.; Skinner, R.F., Thermal Unimolecular Isomerization of Susbituted Cyclobutenes Part 4. 1,3-Dimethylcyclobutene and 1,4-Dimethylcyclobutene, Trans. Faraday Soc., 1965, 61, 861. [all data]