00258nam a2200109Ia 4500008004100000041000800041082001700049100001600066245002500082260003300107300000800140211209s1998    xx            000 0 und d  aeng  a658.4034 GUP  aGUPTA, ANJU  aOPERATIONS RESEARCH   aNEW DELHIbEXCEL BOOKSc1998  a239