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A. A. A. M. Danen-Van Oorschot, D. F. Fischer, J. M. Grimbergen, B. Klein, S.-M. Zhuang, J. H. F. Falkenburg, C. Backendorf, P. H. A. Quax, A. J. Van Der Eb and M. H. M. Noteborn. (1997). Apoptin Induces Apoptosis in Human Transformed and Malignant Cells but not in Normal Cells. Proceedings of the National Academy of Sciences of the United States of America, 94(11), 5843–5847. doi:10.2307/42164 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research