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Michael Bartoszek; Matthias Beller; Jens Deutsch; Markus Klawonn; Angela Köckritz; Navid Nemati; Anahit Pews-Davtyan. (2008). A convenient protocol for the synthesis of axially chiral Brønsted acids. , 64(7), 1316–1322. doi:10.1016/j.tet.2007.11.067 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research