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Rockemann, Michael G.; Seeling, Wulf; Bischof, Carsten; Borstinghaus, Dirk; Steffen, Peter; Georgieff, Michael . (1996). Prophylactic Use of Epidural Mepivacaine/Morphine, Systemic Diclofenac, and Metamizole Reduces Postoperative Morphine Consumption after Major Abdominal Surgery. Anesthesiology, 84(5), 1027–1034. doi:10.1097/00000542-199605000-00003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research