Oppenheim, Alan V., <br/><br/>
Signals & systems / 

 - 2nd ed. 
 - Upper Saddle River  Prentice Hall,  1997. 
 - xxx, 957 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0138147574 
<br/><br/><label>LC Class. No.: </label>TK5102.9  / .Op5 1997