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Sandrine Cammas; Isabelle Renard; Karine Boutault; Philippe Guérin. (1993). A novel synthesis of optically active 4-benzyloxy- and 4-alkyloxycarbonyl-2-oxetanones. , 4(8), 1925–1930. doi:10.1016/s0957-4166(00)80433-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research