Birkhoff, Garrett Bartee, Thomas.C <br/><br/>
Modern Applied Algebra 

 - New York  McGraw Hill Book Company  1970 
 - P.431 
<br/><br/><label>ISBN: </label>07-005381-2 
<br/><br/><label>Subjects--Topical Terms: </label> Binary Relations and Graphs  Finite State Machines  Programming Languages  Optimization and Computer Design 
<br/><br/><label>Dewey Class. No.: </label>512.8 B55M