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Steven M. Fazzari, R. Glenn Hubbard, Bruce C. Petersen, Alan S. Blinder and James M. Poterba. (1988). Financing Constraints and Corporate Investment. Brookings Papers on Economic Activity, 1988(1), 141–206. doi:10.2307/2534426 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research