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Guha, Samit; Goodson, Flynt S.; Corson, Lucas J.; Saha, Sourav . (2012). Boundaries of Anion/Naphthalenediimide Interactions: From Anion−π Interactions to Anion-Induced Charge-Transfer and Electron-Transfer Phenomena. Journal of the American Chemical Society, 134(33), 13679–13691. doi:10.1021/ja303173n 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research