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Applied Mathematics Letters > 2005 > 18 > 6 > 679-682
Applied Mathematics Letters > 2003 > 16 > 5 > 797-801
Applied Mathematics Letters > 2003 > 16 > 3 > 389-393
Applied Mathematics Letters > 2005 > 18 > 6 > 679-682
Applied Mathematics Letters > 2003 > 16 > 5 > 797-801
Applied Mathematics Letters > 2003 > 16 > 3 > 389-393