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Navarro, G.; Moreno, E.; Aymerich, M.; Marcellino, D.; McCormick, P. J.; Mallol, J.; Cortes, A.; Casado, V.; Canela, E. I.; Ortiz, J.; Fuxe, K.; Lluis, C.; Ferre, S.; Franco, R. . (2010). Direct involvement of  -1 receptors in the dopamine D1 receptor-mediated effects of cocaine. Proceedings of the National Academy of Sciences, 107(43), 18676–18681. doi:10.1073/pnas.1008911107 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research