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Francisco, Talitha Mayumi; Couto, Dayvid Rodrigues; Zanuncio, José Cola; Serrão, José Eduardo; Silva, Ita de Oliveira; Boere, Vanner; Stanyon, Roscoe . (2014). Vegetable Exudates as Food for Callithrix spp. (Callitrichidae): Exploratory Patterns. PLoS ONE, 9(11), e112321–. doi:10.1371/journal.pone.0112321 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research