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Gregory A. Helm; Charles G. diPierro; Patricia E. Palmer; Nathan E. Simmons; Sven O.E. Ebbesson. (1996). The accessory optic system in the frog, Rana pipiens: An electron microscopic study of the retinal afferents utilizing the anterograde tracer biocytin. , 39(2), 83–87. doi:10.1016/0361-9230(95)02054-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research