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Anna Di Fiore; Simona Maria Monti; Mika Hilvo; Seppo Parkkila; Vincenza Romano; Andrea Scaloni; Carlo Pedone; Andrea Scozzafava; Claudiu T. Supuran; Giuseppina De Simone. (2009). Crystal structure of human carbonic anhydrase XIII and its complex with the inhibitor acetazolamide. , 74(1), 164–175. doi:10.1002/prot.22144 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research