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Kevin R. Kosola, Donald I. Dickmann, Eldor A. Paul and Dylan Parry. (2001). Repeated Insect Defoliation Effects on Growth, Nitrogen Acquisition, Carbohydrates, and Root Demography of Poplars. Oecologia, 129(1), 65–74. doi:10.2307/4223057 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research