Lewis, Harry R. Papadimitriou, Christos H. <br/><br/>
Elements of the theory of computation 

 - New Delhi  PHI  1981 
 - xiv, 466 
<br/><br/><label>ISBN: </label>9788120310162 
<br/><br/><label>Dewey Class. No.: </label>001.6424  LEW;7