00241nam a2200109Ia 4500008004100000041000800041082002600049100001400075245002500089260000900114300000800123211209s1979    xx            000 0 und d  aeng  a658.403 4 N79 GUP/HIR  aGUPTA P K  aOPERATIONS RESEARCH   c1979  a456