000			00367nam a2200169Ia 4500
008			240220s9999 xx 000 0 und d
041			_aENG
100			_aCarlson A. B.
245		0	_aCommunication systems
260			_aDelhi
260			_bMc Graw-Hill International.
260			_c1986
300			_a686p.
365			_b270.3
650			_aETC
942			_cDBK
999			_c20732 _d20732