Introduction to the theory of computation 
Sipser, Michael. 
 -  PWS Pub. Co.,  1997 
 - xv, 396 p. 
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<br/><br/><label>ISBN: </label>0-534-94728-X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computational complexity.
<br/><br/><label>Dewey Class. No.: </label>511.3 Si7i 1997