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Liu, X. et al. (2019). Sparse inverse covariance matrix estimation via the ℓ0-norm with Tikhonov regularization*The research is supported by the Special Project on High-performance Computing under the National Key R&D Program (Grant No. 2016YFB0200602), by the Natural Science Foundation of China under Grant Nos. 11701189 and 11771464.. Inverse problems. p. . [Online].