Applied Mathematics Letters
Applied Mathematics Letters > 2003 > 16 > 2 > 173-178
Applied Mathematics Letters > 2004 > 17 > 7 > 833-838
Applied Mathematics Letters > 2006 > 19 > 11 > 1152-1158
Applied Mathematics Letters > 2003 > 16 > 2 > 173-178
Applied Mathematics Letters > 2004 > 17 > 7 > 833-838
Applied Mathematics Letters > 2006 > 19 > 11 > 1152-1158