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Diefenderfer, H. L.; Thom, R. M.; Johnson, G. E.; Skalski, J. R.; Vogt, K. A.; Ebberts, B. D.; Roegner, G. C.; Dawley, E. M. . (2011). A Levels-of-Evidence Approach for Assessing Cumulative Ecosystem Response to Estuary and River Restoration Programs. Ecological Restoration, 29(1-2), 111–132. doi:10.3368/er.29.1-2.111 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research