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Rahma, Abbas E.; Lei, Tingwu; Shi, Xiaonan; Dong, Yuequn; Zhou, Shumei; Zhao, Jun . (2013). Measuring flow velocity under straw mulch using the improved electrolyte tracer method. Journal of Hydrology, 495(), 121–125. doi:10.1016/j.jhydrol.2013.04.049 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research