Applied Mathematics Letters
Applied Mathematics Letters > 2006 > 19 > 4 > 320-325
Applied Mathematics Letters > 2006 > 19 > 5 > 491-497
Applied Mathematics Letters > 2006 > 19 > 7 > 639-646
Applied Mathematics Letters > 2006 > 19 > 8 > 758-766
Applied Mathematics Letters > 2006 > 19 > 11 > 1237-1243
Applied Mathematics Letters > 2006 > 19 > 11 > 1202-1206