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Dieter Paul, Allan Lipton and Ingrid Klinger. (1971). Serum Factor Requirements of Normal and Simian Virus 40-Transformed 3T3 Mouse Fibroblasts. Proceedings of the National Academy of Sciences of the United States of America, 68(3), 645–648. doi:10.2307/60533 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research