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Liu, Xiao Fei; Xu, Jian Xin; Sun, Jing Sheng; Fei, Liang Jun; Zhang, Ji Yang; Shen, Xiao Jun; Chen, Zhi Fang . (2013). Water-Saving Irrigation and Food Security in China. Applied Mechanics and Materials, 438-439(), 1441–1445. doi:10.4028/www.scientific.net/amm.438-439.1441 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research