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Pierpaolo Vittorini; Antonietta Tarquinio; Ferdinando di Orio. (2009). XML technologies for the Omaha System: A data model, a Java tool and several case studies supporting home healthcare. , 93(3), 297–312. doi:10.1016/j.cmpb.2008.10.009 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research