000 00283nam a2200121Ia 4500
008 211209s9999 xx 000 0 und d
020 _a9.78812E+12
041 _aeng
082 _a004.6 GUP
100 _aGUPTA
245 _aDATA COMMUNICATIONS AND COMPUTER NETWORKS
260 _bPHI
999 _c77370
_d77370