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Stern, Robert S.; Bolshakov, Svetlana; Nataraj, Arun J.; Ananthaswamy, Honnavara N. . (2002). p53 Mutation in Nonmelanoma Skin Cancers Occurring in Psoralen Ultraviolet A-Treated Patients: Evidence for Heterogeneity and Field Cancerization. Journal of Investigative Dermatology, 119(2), 522–526. doi:10.1046/j.1523-1747.2002.01814.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research