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Bocca, Jorge. (1986). [ACM Press the 1986 ACM SIGMOD international conference - Washington, D.C., United States (1986.05.28-1986.05.30)] Proceedings of the 1986 ACM SIGMOD international conference on Management of data - SIGMOD '86 - On the evaluation strategy of EDUCE. , (), 368–378. doi:10.1145/16894.16890 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research