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Banker, Rajiv D.; Li, Shaopeng; Plehn-Dujowich, Jose M. . (2010). Screening Versus Sorting in a Principal-Agent Model with Moral Hazard and Adverse Selection. SSRN Electronic Journal, (), –. doi:10.2139/ssrn.1659935 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research