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Gao, Weinan; Jiang, Zhong-Ping . (2017). Learning-Based Adaptive Optimal Tracking Control of Strict-Feedback Nonlinear Systems. IEEE Transactions on Neural Networks and Learning Systems, (), 1–11. doi:10.1109/tnnls.2017.2761718 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research