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Olsson-Liljequist, B; Dornbusch, K; Nord, C E . (1980). Characterization of three different beta-lactamases from the Bacteroides fragilis group.. Antimicrobial Agents and Chemotherapy, 18(2), 220–225. doi:10.1128/AAC.18.2.220 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research