00275nam a2200109Ia 4500008004100000041000800041082001800049100002100067245002500088260004400113300000800157211209s1998    xx            000 0 und d  aeng  a004.6 N98 GUP  aGUPTA, PRAKASH C  aDATA COMMUNICATIONS   aNEW DELHIbPRENTICE-HALL OF INDIAc1998  a475