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René Csuk; Anke Heinold; Bianka Siewert; Stefan Schwarz; Alexander Barthel; Ralph Kluge; Dieter Ströhl. (2012). Synthesis and Biological Evaluation of Antitumor-Active Arglabin Derivatives. , 345(3), 215–222. doi:10.1002/ardp.201100065 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research