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J.C. Freitas; E.L.A. Malpezzi. (1995). Occurrence of toxins, other than paralysing type, in the skin of Diodontidae pufferfish. , 33(3), 0–280. doi:10.1016/0041-0101(95)99294-d 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research