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Tazi, Mehdi; Roisnel, Thierry; Mongin, Florence; Erb, William . (2017). Ferrocenecarboxylic anhydride: identification of a new polymorph. Acta Crystallographica Section C Structural Chemistry, 73(10), 760–766. doi:10.1107/s205322961701124x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research