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Queiroz, Erika Kaltenecker Retto de; Waissmann, William . (2006). Occupational exposure and effects on the male reproductive system. Cadernos de Saúde Pública, 22(3), 485–493. doi:10.1590/S0102-311X2006000300003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research