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Bierman, B.; O’Donnell, J.; Burke, R.; McCormick, M.; Lindsay, W. . (2014). Construction of an Enclosed Trough EOR System in South Oman. Energy Procedia, 49(), 1756–1765. doi:10.1016/j.egypro.2014.03.186 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research