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Roy, A.; Eisenhut, M.; Harris, R. J.; Rodrigues, L. C.; Sridhar, S.; Habermann, S.; Snell, L.; Mangtani, P.; Adetifa, I.; Lalvani, A.; Abubakar, I. . (2014). Effect of BCG vaccination against Mycobacterium tuberculosis infection in children: systematic review and meta-analysis. BMJ, 349(aug04 5), g4643–g4643. doi:10.1136/bmj.g4643 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research