000 00303nam a2200133Ia 4500
008 160902s9999 xx 000 0 und d
040 _cPK-GjGUL
082 _a004.6
_bINT-I
245 0 _aIntroduction to data communications
260 _aUnknow
_bunknown
300 _a344
546 _aeng
942 _cBK
999 _c4562
_d4562