000 00278nam a2200109Ia 4500
008 230411s9999 xx 000 0 und d
082 _a621.382
_bSPR
100 _a SPRAGINS (JOHN D.)
245 0 _aTelecommunications : Protocols and Design
260 _bReading (A.W
942 _cBK
999 _c1578
_d1578