Ravi Kumar, I <br/><br/>
Signals and systems 

 -  New Delhi  PHI Learning  2009 
 - xii, 563p.   
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9788120338517 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Discrete-time signals<br/>Electronics and Communication engineering<br/>Fourier transforms<br/>Signals and Systems