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Higgins, Stephen T.; Kurti, Allison N.; Redner, Ryan; White, Thomas J.; Keith, Diana R.; Gaalema, Diann E.; Sprague, Brian L.; Stanton, Cassandra A.; Roberts, Megan E.; Doogan, Nathan J.; Priest, Jeff S. . (2016). Co-Occurring Risk Factors for Current Cigarette Smoking in a U.S. Nationally Representative Sample. Preventive Medicine, (), S0091743516300044–. doi:10.1016/j.ypmed.2016.02.025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research