000 00276nam a2200121Ia 4500
020 _a9788120322295
100 _aWilliam Schweber
245 _aElectronic Communication Systems
250 _a4th
260 _bPHI Learning
_aNew Delhi
_c2009
300 _axii+820
942 _cBK
999 _c57349
_d57349