Mathematical and Computer Modelling
Mathematical and Computer Modelling > 2009 > 49 > 3-4 > 548-555
Mathematical and Computer Modelling > 2009 > 49 > 3-4 > 672-680
Mathematical and Computer Modelling > 2009 > 49 > 7-8 > 1595-1606
Mathematical and Computer Modelling > 2009 > 50 > 1-2 > 116-122