000 00342nam a2200157Ia 4500
001 12607
008 141107s9999 xx 000 0 und d
020 _a0-07-057157-0
050 _aTK 7815.S5 1991
245 _aElectronic Communication
250 _a0
260 _aLondon
260 _bMcgraw-Hill
260 _c1991
300 _a,;ill.
999 _c47576
_d47576