00295    a2200097   4500082001500000100002400015245008200039260003600121300001600157650002400173  a511.8bOPE  aThe Open University  aMathematical modelling 1 (non statistical modelling)bBlock 1 bchapters 1 -4  aNawalabThe Open Universityc19  a120p.c30cm  aMathematical models