Hopcroft, John E. <br/><br/>
Introduction To Automata Theory, Languages , and Computation 
John E. Hopcroft , Rajeev Motwani , Jeffrey D. Ullman 
 - 3rd,ed. 
 - Boston  Pearson / Addison Wesley  2007 
 - xvii, 535p.  ill.  23cm. 
<br/><br/> includes index : p. 527 - 535 
<br/><br/>References 
<br/><br/><label>ISBN: </label>9780321462251 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computational complexity<br/>Formal languages<br/>Machine Theory