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Llobet, J. M.; Falcó, G.; Casas, C.; Teixidó, A.; Domingo, J. L. . (2003). Concentrations of Arsenic, Cadmium, Mercury, and Lead in Common Foods and Estimated Daily Intake by Children, Adolescents, Adults, and Seniors of Catalonia, Spain. Journal of Agricultural and Food Chemistry, 51(3), 838–842. doi:10.1021/jf020734q 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research