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Kondoh, Azusa; Yorimitsu, Hideki; Oshima, Koichiro . (2008). Regio- and Stereoselective Hydroamidation of 1-Alkynylphosphine Sulfides Catalyzed by Cesium Base. Organic Letters, 10(14), 3093–3095. doi:10.1021/ol8010979 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research