00279nam a2200133Ia 4500020000900000082000800009100003100017245002400048250000800072260004100080300000900121500000900130650000600139  aNULL  a519  aGupta, P. K. / Hira, D. S. 0aOperations Research  a3rd  aNew DelhibS. Chand and Company Ltd.  a1055  a3437  a-