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Grim, R. D.; McElwain, D.; Hartmann, R.; Hudak, M.; Young, S. . (2010). Evaluating Causes for Unplanned Hospital Readmissions of Palliative Care Patients. American Journal of Hospice and Palliative Medicine, 27(8), 526–531. doi:10.1177/1049909110368528 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research