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Author: Chen, Yizhi

• Chen, Yizhi; Zhao, Xianzhong; Liu, Zhongzhu: On upper triangular nonnegative matrices. (English). Czechoslovak Mathematical Journal, vol. 65 (2015), issue 1, pp. 1-20
• Chen, Yizhi; Zhao, Xianzhong: On linear operators strongly preserving invariants of Boolean matrices. (English). Czechoslovak Mathematical Journal, vol. 62 (2012), issue 1, pp. 169-186