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Linear Algebra and Its Applications > 2011 > 435 > 4 > 902-907
Computers and Mathematics with Applications > 2011 > 61 > 4 > 1122-1128
Linear Algebra and Its Applications > 2011 > 435 > 4 > 902-907
Computers and Mathematics with Applications > 2011 > 61 > 4 > 1122-1128