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Ribeiro, J. A. S.; Messias, A.; de Almeida, F. P. P.; Costa, R. A.; Scott, I. U.; de Figueiredo-Pontes, L. L.; Jorge, R. . (2011). The effect of intravitreal ranibizumab on intraoperative bleeding during pars plana vitrectomy for diabetic traction retinal detachment. British Journal of Ophthalmology, 95(9), 1337–1339. doi:10.1136/bjo.2010.195693 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research