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Jennifer K. Wagner; Esteban J. Parra; Heather L. Norton; Celina Jovel; Mark D. Shriver. (2002). Skin Responses to Ultraviolet Radiation: Effects of Constitutive Pigmentation, Sex, and Ancestry. , 15(5), 385–390. doi:10.1034/j.1600-0749.2002.02046.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research