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Liu, Guosheng; Stahl, Shannon S. . (2007). Two-Faced Reactivity of Alkenes:  <i>cis</i> - versus <i>trans-</i> Aminopalladation in Aerobic Pd-Catalyzed Intramolecular Aza-Wacker Reactions. Journal of the American Chemical Society, 129(19), 6328–6335. doi:10.1021/ja070424u 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research