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Schiozer, Rafael Felipe; Saito, Cristiana Checchia; Saito, Richard . (2011). Financial health and customer satisfaction in private health care providers in Brazil. Cadernos de Saúde Pública, 27(11), 2175–2187. doi:10.1590/s0102-311x2011001100011 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research