Digital and analog communication systems 
Couch III, Leon W. 
 -  Macmillan Publishing Company.  1990 
 - xxix, 766 pages. 
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<br/><br/><label>ISBN: </label>0-02-325391-6 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Digital communiucations.
<br/><br/><label>Dewey Class. No.: </label>621.380413 C69d 1990