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Zeng, Wenzhi; Xu, Chi; Huang, Jiesheng; Wu, Jingwei; Ma, Tao . (2015). Emergence Rate, Yield, and Nitrogen-Use Efficiency of Sunflowers ( <i>Helianthus annuus</i> ) Vary with Soil Salinity and Amount of Nitrogen Applied. Communications in Soil Science and Plant Analysis, 46(8), 1006–1023. doi:10.1080/00103624.2015.1018529 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research