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Cias, Pawel; Gescheidt, Georg . (2015). Environmental effects on Cu(II)-catalyzed hetero-Diels–Alder reactions: computational approach. Monatshefte für Chemie - Chemical Monthly, 146(8), 1267–1274. doi:10.1007/s00706-015-1510-z 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research