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Sakai, Tomoya; Nakatani, Toshiaki; Takahashi, Natsuki; Kunugi, Taiseki . (1972). Thermal Reactions of 4-Vinylcyclohexene, Cyclohexene, and 4-Methylcyclohexene. Kinetics and Mechanism. Industrial & Engineering Chemistry Fundamentals, 11(4), 529–533. doi:10.1021/i160044a016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research