00323nam a2200121Ia 4500008004100000082001500041100001400056245003900070250000900109260002600118300000600144650005100150150614s9999    xx            000 0 und d  a003  GUP-O  aP K Gupta  aIntroduction to Operation Research  aI ED  bS.Chand & Co.Delhic0  a0  aIntroduction to Operation Research  P K Gupta,