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Santos, Djanilson Barbosa dos; Barreto, Mauricio Lima; Coelho, Helena Lutescia Luna . (2011). Use of prescribed and non-prescribed medications among children living in poor areas in the city of Salvador, Bahia State, Brazil. Cadernos de Saúde Pública, 27(10), 2032–2040. doi:10.1590/s0102-311x2011001000016 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research