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Applied Mathematics Letters > 2004 > 17 > 7 > 833-838
Computers and Mathematics with Applications > 2004 > 47 > 10-11 > 1487-1494
Applied Mathematics and Computation > 2004 > 150 > 2 > 481-492
Applied Mathematics Letters > 2004 > 17 > 7 > 833-838
Computers and Mathematics with Applications > 2004 > 47 > 10-11 > 1487-1494
Applied Mathematics and Computation > 2004 > 150 > 2 > 481-492