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Claudio C. Silveira; Rodrigo Cella; Adriano S. Vieira. (2006). Stereoselective synthesis of vinylic (Z)-vic-bis(arylchalcogenides). , 691(26), 5861–5866. doi:10.1016/j.jorganchem.2006.09.045 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research