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H.G. Kiryakov; Z.H. Mardirossian; D.B. MacLean; J.P. Ruder. (1981). Bicucullinidine, an alkaloid of Fumaria schrammii. , 20(7), 1721–1723. doi:10.1016/s0031-9422(00)98563-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research