Sipser, Michael <br/><br/>
Introduction to the theory of computation / 
Michael Sipser 
 - 2nd ed. 
 - Boston :  Thomson Course Technology,  2006 
 - xix, 431 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references (p. 415-419) and index 
<br/><br/><label>ISBN: </label>0534950973  RM415.80 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Machine theory<br/>Computational complexity