Oppenheim, Alan V ...[et al.]. <br/><br/>
Signals and systems / 

 - 2nd ed. 
 - New Delhi,  Prentice Hall,  c2006. 
 - xxx, 957 p. ;  ill. ; 
<br/><br/><label>ISBN: </label>8120312465 
<br/><br/><label>Dewey Class. No.: </label>621.3822320