00297nam a2200109Ia 4500008004100000082001500041100002000056245003800076250001200114260005000126300001100176150201s2012    xx            000 0 und d  a658.4bWAG  aWagner,Harvey M  aPrinciples of operations research  a2nd Ed.  bPHI Learning Private LimitedaNew Delhic2012  a1039p.