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Agarwal, Nivedita; Grottke, Michael; Mishra, Shefali; Brem, Alexander . (2017). A Systematic Literature Review of Constraint-Based Innovations: State of the Art and Future Perspectives. IEEE Transactions on Engineering Management, 64(1), 3–15. doi:10.1109/TEM.2016.2620562 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research