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Eric M. O'Neill and Joseph R. Mendelson III. (2004). Taxonomy of Costa Rican Toads Referred to Bufo melanochlorus Cope, with the Description of a New Species. Journal of Herpetology, 38(4), 487–494. doi:10.2307/1565747 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research