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Wu, Zongze; Cai, Qianqian; Fu, Minyue . (2017). Covariance Intersection for Partially Correlated Random Vectors. IEEE Transactions on Automatic Control, (), 1–1. doi:10.1109/tac.2017.2718243 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research