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Andrew M. Standeven; Maria Escobar; Richard L. Beard; Yang-Dar Yuan; Roshantha A.S. Chandraratna. (1997). Mitogenic effect of retinoid X receptor agonists in rat liver. , 54(4), 517–524. doi:10.1016/s0006-2952(97)00209-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research