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D'Alessandro, A.; Rausch, R. L. . (2008). New Aspects of Neotropical Polycystic (Echinococcus vogeli) and Unicystic (Echinococcus oligarthrus) Echinococcosis. Clinical Microbiology Reviews, 21(2), 380–401. doi:10.1128/CMR.00050-07 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research