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Kirshenbaum, Ari P.; Brown, Seth J.; Hughes, David M.; Doughty, Adam H. . (2008). Differential-reinforcement-of-low-rate-schedule performance and nicotine administration: a systematic investigation of dose, dose-regimen, and schedule requirement. Behavioural Pharmacology, 19(7), 683–697. doi:10.1097/fbp.0b013e328315ecbb 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research