000 00302nam a2200121Ia 4500
008 240531s9999 xx 000 0 und d
020 _a978 0 431 99006 4
082 _a004 6BAS
100 _aNULL
245 0 _aBasic Concepts in Data Communications.
260 _aLondon
_b I C L
_c1983
942 _cANF
999 _c332813
_d332813