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Journal of Systems Science and Complexity > 2019 > 32 > 1 > 37-46
Science China Mathematics > 2006 > 49 > 10 > 1341-1352
Journal of Systems Science and Complexity > 2019 > 32 > 1 > 37-46
Science China Mathematics > 2006 > 49 > 10 > 1341-1352