00321nam a2200121Ia 4500008004100000082001700041100002200058245003400080260004100114300001000155630001800165650001600183211109s9999||||xx |||||||||||||| ||und||  a510.7bGUP-P  aGupta, Prem Kumar 0aProblems in Operatons Reseach  bS.Chand and CompanyaNew Delhic1991  a1078p  xGENERAL STACK  vMathematics