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Larraufie, Marie-Hélène; Maestri, Giovanni; Malacria, Max; Ollivier, Cyril; Fensterbank, Louis; Lacôte, Emmanuel . (2012). The Cyanamide Moiety, Synthesis and Reactivity. Synthesis, 44(9), 1279–1292. doi:10.1055/s-0031-1289749 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research