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Seow, W.K.; Clifford, H.; Battistutta, D.; Morawska, A.; Holcombe, T. . (2009). Case-Control Study of Early Childhood Caries in Australia. Caries Research, 43(1), 25–35. doi:10.1159/000189704 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research