00309nam a2200121Ia 4500008004100000020002200041082002000063100001600083245002400099250000800123260004500131300001100176260330s9999    xx            000 0 und d  a9.7881219028e+012  a658.4034bGUP/O  aGupta, P.K. 0aOperations Research  a7th  aNew DelhibS.Chand And Company Ltdc2025  a1498p.