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Sun, C. Z.; Jiang, H. Q.; Li, J. J.; Ye, S. J. . (2011). Pore Network Modeling of a Polymer Flooding Microscopic Seepage Mechanism. Petroleum Science and Technology, 29(17), 1803–1810. doi:10.1080/10916466.2011.578098 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research