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Li, Liwei; Khorsandi, Saeid; Johns, Russell T.; Dilmore, Robert M. . (2015). CO2 enhanced oil recovery and storage using a gravity-enhanced process. International Journal of Greenhouse Gas Control, 42(), 502–515. doi:10.1016/j.ijggc.2015.09.006 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research