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Applied Mathematical Modelling > 2011 > 35 > 9 > 4449-4457
Mathematical and Computer Modelling > 2010 > 52 > 7-8 > 1194-1202
Applied Mathematical Modelling > 2011 > 35 > 9 > 4449-4457
Mathematical and Computer Modelling > 2010 > 52 > 7-8 > 1194-1202