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Linear Algebra and Its Applications > 2006 > 416 > 2-3 > 298-312
Applied Mathematics Letters > 2003 > 16 > 5 > 797-801
Discrete Mathematics > 2003 > 265 > 1-3 > 31-44
Applied Mathematics Letters > 2003 > 16 > 3 > 389-393
Applied Mathematics Letters > 2003 > 16 > 3 > 297-302