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Li, Qianqian; Cui, Xiaoqing; Liu, Xuejun; Roelcke, Marco; Pasda, Gregor; Zerulla, Wolfram; Wissemeier, Alexander H.; Chen, Xinping; Goulding, Keith; Zhang, Fusuo . (2017). A new urease-inhibiting formulation decreases ammonia volatilization and improves maize nitrogen utilization in North China Plain. Scientific Reports, 7(), 43853–. doi:10.1038/srep43853 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research