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Donald W. Jones; Edward L.Hillsman; Russell Lee; Cheryl B. Foust. (1986). Production functions and tract rents in Western U.S. surface coal mining. , 8(1), 35–61. doi:10.1016/0165-0572(86)90021-6 

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