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Applied Mathematics Letters > 2004 > 17 > 3 > 249-252
Discrete Applied Mathematics > 1998 > 83 > 1-3 > 263-278
Discrete Applied Mathematics > 1996 > 66 > 3 > 255-270
Applied Mathematics Letters > 2004 > 17 > 3 > 249-252
Discrete Applied Mathematics > 1998 > 83 > 1-3 > 263-278
Discrete Applied Mathematics > 1996 > 66 > 3 > 255-270