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Wolter, D. J.; Kurpiel, P. M.; Woodford, N.; Palepou, M.-F. I.; Goering, R. V.; Hanson, N. D. . (2009). Phenotypic and Enzymatic Comparative Analysis of the Novel KPC Variant KPC-5 and Its Evolutionary Variants, KPC-2 and KPC-4. Antimicrobial Agents and Chemotherapy, 53(2), 557–562. doi:10.1128/AAC.00734-08 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research