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Vranova, Valerie; Rejsek, Klement; Skene, Keith R.; Janous, Dalibor; Formanek, Pavel . (2013). Methods of collection of plant root exudates in relation to plant metabolism and purpose: A review. Journal of Plant Nutrition and Soil Science, 176(2), 175–199. doi:10.1002/jpln.201000360 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research