Buchi, J Richard <br/><br/>
Finite automata, their algebras and grammars: Towards a theory of formal expressions 

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 - New York  Springer-Verlag  1988 
 - 316   
<br/><br/>   
<br/><br/><label>ISBN: </label>0-387-96905-5 
<br/><br/><label>ISSN: </label>
<br/><br/><label>Dewey Class. No.: </label>519.713