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Mihaela Skobe and Norbert E. Fusenig. (1998). Tumorigenic Conversion of Immortal Human Keratinocytes through Stromal Cell Activation. Proceedings of the National Academy of Sciences of the United States of America, 95(3), 1050–1055. doi:10.2307/44231 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research