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Bindewald, A. (2005). Lower limits of fluorescein and indocyanine green dye for digital cSLO fluorescence angiography. British Journal of Ophthalmology, 89(12), 1609–1615. doi:10.1136/bjo.2005.070409 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research