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Buchanan, Joan L.; Keeler, Emmett B.; Rolph, John E.; Holmer, Martin R. . (1991). Simulating Health Expenditures Under Alternative Insurance Plans. Management Science, 37(9), 1067–1090. doi:10.1287/mnsc.37.9.1067 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research