000 00348nam a2200157Ia 4500
008 190201s9999 xx 000 0 und d
020 _a727303015
082 _a621
082 _b38 C51
100 _a"Clark, A P"
245 0 _aAdvanced Data Transmissi
260 _aLondon
260 _bPentech Press
260 _c1977
300 _a"XII, 427"
999 _c25261
_d25261