000			00309nam a2200133Ia 4500
008			161018s9999 xx 000 0 und d
020			_a9788131503072
100			_aBlake,R.
245			_aElectronic Communication Systems
250			_a2NDEd
260			_bCengage Learning
300			_bRs:450
490			_a9304
999			_c9304 _d9304