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Rémi Martin-Fardon; Friedbert Weiss. (2000). N-[1-(2-Benzo[b]Thiophenyl)Cyclohexyl]- Piperidine (BTCP) Exerts Cocaine-Like Actions on Drug-Maintained Responding in Rats. , 23(3), 316–325. doi:10.1016/s0893-133x(00)00104-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research