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Mikulewicz, Marcin; Chojnacka, Katarzyna; Gedrange, Thomas; Górecki, Henryk . (2013). Reference values of elements in human hair: A systematic review. Environmental Toxicology and Pharmacology, 36(3), 1077–1086. doi:10.1016/j.etap.2013.09.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research