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Gouveia, F.B.P.; Barbosa, M.L.L.; Barrett, T.V. . (2012). Arthropods associated with nests of <i>Cacicu</i> s sp. and <i>Psarocolius</i> sp. (Passerida: Icteridae) in varzea forest near the meeting of the rivers Negro and Solimões (Central Amazonia, Brazil) at high water. Journal of Natural History, 46(15-16), 979–1003. doi:10.1080/00222933.2011.651642 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research