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Irene Gottlob; Sheryl S. Wizov; Robert D. Reinecke. (1995). Visual acuities and scotomas after 3 weeks' levodopa administration in adult amblyopia. , 233(7), 407–413. doi:10.1007/bf00180943 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research