000 00270nam a2200121Ia 4500
008 211209s9999 xx 000 0 und d
020 _a9.78007E+12
041 _aeng
082 _a004.6 GAR
100 _aLEON GARCIA
245 _aCOMMUNICATION NETWORKS
260 _bTMH
999 _c77227
_d77227