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Johannes M. Baveco; Harold Kuipers; Bart A. Nolet. (2011). A large-scale multi-species spatial depletion model for overwintering waterfowl. , 222(20-22), 3773–3784. doi:10.1016/j.ecolmodel.2011.09.012 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research