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Applied Mathematics Letters > 2009 > 22 > 8 > 1303-1308
Journal of Computational and Applied Mathematics > 2008 > 222 > 2 > 351-363
Applied Mathematics Letters > 2009 > 22 > 8 > 1303-1308
Journal of Computational and Applied Mathematics > 2008 > 222 > 2 > 351-363