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Computers and Mathematics with Applications > 2004 > 48 > 3-4 > 577-588
Bulletin des sciences mathematiques > 2004 > 128 > 4 > 291-302
Computers and Mathematics with Applications > 2004 > 48 > 3-4 > 577-588
Bulletin des sciences mathematiques > 2004 > 128 > 4 > 291-302