Continuous and discrete signals and systems 
Soliman, Samir S. 
 - Second edition. 
 -  Prentice Hall, Inc.  1990 
 - xvii,525 pages. 
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<br/><br/><label>ISBN: </label>0-13-569112-5 
<br/><br/><label>Dewey Class. No.: </label>621.380 Sol4c 1990