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Wang, Linlin; Lan, Yubin; Zhang, Yali; Zhang, Huihui; Tahir, Muhammad Naveed; Ou, Shichao; Liu, Xiaotao; Chen, Pengchao . (2019). Applications and Prospects of Agricultural Unmanned Aerial Vehicle Obstacle Avoidance Technology in China. Sensors, 19(3), 642–. doi:10.3390/s19030642 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research