Introduction to the theory of computation 
Sipser, Michael. 
 -  Thomson Course Technology,  2006 
 - xvii, 437 p. 
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<br/><br/><label>ISBN: </label>0-619-21764-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Computational complexity.
<br/><br/><label>Dewey Class. No.: </label>511.35 S17i 2006