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J. E. Wodsedalek. (1912). Palmen's Organ and Its Function in Nymphs of the Ephemeridæ, Heptagenia Interpunctata (Say) and Ecdyurus Maculipennis (Walsh). Biological Bulletin, 22(4), 253–272. doi:10.2307/1535890 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research