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Cornejo, Kristine M.; Frazier, Lindsay; Lee, Richard S.; Kozakewich, Harry P.W.; Young, Robert H. . (2015). Yolk Sac Tumor of the Testis in Infants and Children. The American Journal of Surgical Pathology, 39(8), 1121–1131. doi:10.1097/pas.0000000000000432 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research