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Applied Mathematical Modelling > 2007 > 31 > 9 > 1729-1738
Journal of Mathematical Analysis and Applications > 2006 > 324 > 1 > 397-408
Journal of Differential Equations > 2003 > 194 > 2 > 237-286
Applied Mathematical Modelling > 2007 > 31 > 9 > 1729-1738
Journal of Mathematical Analysis and Applications > 2006 > 324 > 1 > 397-408
Journal of Differential Equations > 2003 > 194 > 2 > 237-286