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Clarke, A. M.; Geeraets, Walter J.; Ham, Jr., William T.. (1969). An Equilibrium Thermal Model for Retinal Injury from Optical Sources. ao/8/5/ao-8-5-1051.pdf, 8(5), 1051–0. doi:10.1364/AO.8.001051 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research