000			002910000a22001330004500
245			_aElectronic communications
100			_aRoddy, D.
100			_aCoolen, J.
250			_a3d ed.
260			_aNew Delhi _bPrentice Hall _c1986
080			_a621.391 _bR6
041			_aEN
942			_cBK
999			_c117653 _d117653