00397nam a2200133 a 4500020002600000020002300026100001800049245002400067260004200091300001300133650003800146650002000184856005900204  a9789694073644 ( pbk )  a9694073642 ( pbk )1 aHasnain, S K.10aSignals and Systems  aKarachi :bRoyal Book Company,c2009.  a432 p. ;  aSignal Theory (Telecommunication)  aSystem Analysis40uhttp://www.amazon.com/exec/obidos/ASIN/chopaconline-20