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XU, Ping; LIANG, Lin-Zhou; DONG, Xiao-Ying; XU, Jing; JIANG, Pei-Kun; SHEN, Ren-Fang . (2014). Response of Soil Phosphorus Required for Maximum Growth of Asparagus officinalis L. to Inoculation of Arbuscular Mycorrhizal Fungi. Pedosphere, 24(6), 776–782. doi:10.1016/S1002-0160(14)60064-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research