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Discrete Mathematics > 2008 > 308 > 18 > 4298-4303
Linear Algebra and Its Applications > 2006 > 412 > 2-3 > 161-221
Discrete Mathematics > 2008 > 308 > 18 > 4298-4303
Linear Algebra and Its Applications > 2006 > 412 > 2-3 > 161-221