00294nam a2200121Ia 4500008004100000020001900041041000800060082001400068100002100082245004700103260001400150300000800164211209s2009    xx            000 0 und d  a97888120328464  aeng  a004.6 GUP  aGUPTA, PRAKASH C  aDATA COMMUNICATIONS AND COMPUTER NETWORKS   bPHIc2009  a800