00269nam a2200133Ia 4500020000900000082000800009100001700017245003500034250000600069260004000075300000800115500000600123650000600129  aNULL  a519  aGupta, P. K. 0aProblems In Operation Research  a-  aN. DelhibS. Chand and Company Ltd.  a861  a0  a-