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de Carvalho, Loretta Ennes; Magalhães, Lyege A.M.; Lima, Maria da Paz; Marques, Marcia Ortiz Mayo; Facanali, Roselaine . (2013). Essential Oils of <i>Protium</i> of the Adolpho Ducke Forest Reserve: <i>Protium crassipetalum, P. heptaphyllum</i> subs. <i>ulei, P. pilosissimum</i> and <i>P. polybotryum</i>. Journal of Essential Oil Bearing Plants, 16(4), 551–554. doi:10.1080/0972060X.2013.831557 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research