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Yu, Wenwu; Chen, Guanrong; Cao, Ming . (2011). Consensus in Directed Networks of Agents With Nonlinear Dynamics. IEEE Transactions on Automatic Control, 56(6), 1436–1441. doi:10.1109/TAC.2011.2112477 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research