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LIU, Ke; ZHOU, Qing-bo; WU, Wen-bin; XIA, Tian; TANG, Hua-jun . (2016). Estimating the crop leaf area index using hyperspectral remote sensing. Journal of Integrative Agriculture, 15(2), 475–491. doi:10.1016/S2095-3119(15)61073-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research