000 003380000a22001450004500
245 _aTelecommunications : a systems approach
100 _aSmol, G.
100 _aHamer, M.P.R.
100 _aHills, M.T.
260 _aLondon
_bGeorge Allen & Unwin
_c1976
300 _a270 p.
080 _a621.39
_bS6
041 _aEN
942 _cBK
999 _c103168
_d103168