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El-Shafeiy, Moataz; Birgel, Daniel; El-Kammar, Ahmed; El-Barkooky, Ahmed; Wagreich, Michael; Tahoun, Sameh; Peckmann, Jörn . (2017). Integrated palaeo-environmental proxies of the Campanian to Danian organic-rich Quseir section, Egypt. Marine and Petroleum Geology, (), S0264817217302325–. doi:10.1016/j.marpetgeo.2017.06.025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research