Applied Mathematics Letters
Applied Mathematics Letters > 1999 > 12 > 7 > 51-58
Applied Mathematics Letters > 2005 > 18 > 3 > 267-272
Applied Mathematics Letters > 2009 > 22 > 2 > 221-225
Applied Mathematics Letters > 1999 > 12 > 7 > 51-58
Applied Mathematics Letters > 2005 > 18 > 3 > 267-272
Applied Mathematics Letters > 2009 > 22 > 2 > 221-225