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Kemnitz, Carl R.; Loewen, Mark J. . (2007). “Amide Resonance” Correlates with a Breadth of C−N Rotation Barriers. Journal of the American Chemical Society, 129(9), 2521–2528. doi:10.1021/ja0663024 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research