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Jacobi, Claudia Maria; Fonseca do Carmo, Flávio . (2008). The Contribution of Ironstone Outcrops to Plant Diversity in the Iron Quadrangle, a Threatened Brazilian Landscape. AMBIO: A Journal of the Human Environment, 37(4), 324–326. doi:10.1579/0044-7447(2008)37[324:TCOIOT]2.0.CO;2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research