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D. Dwuma-Badu; J.S.K. Ayim; A.N. Tackie; J.E. Knapp; D.J. Slatkin; P.L. Schiff Jr.. (1975). Additional alkaloids of Triclisia patens and Triclisia subcordata. , 14(11), 2524–2525. doi:10.1016/0031-9422(75)80390-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research