000 00276nam a2200109Ia 4500
008 220120s9999||||xx |||||||||||||| ||und||
020 _a9780099493822
100 _aBlack, Uyless, D
_91123
245 0 _aData communications and networks
260 _bLondon
300 _a487p.
_b0
999 _c136581
_d136581