Saaty, Thomas L. <br/><br/>
The four-color problem :  assaults and conquest / 
Thomas L. Saaty and Paul C. Kainen. 
 - New York :  Dover Publications,  1986. 
 - vi, 217 p. :  ill. ;  21 cm. 
<br/><br/> Includes index. 
<br/><br/>Bibliography: p. 197-211. 
<br/><br/><label>ISBN: </label>0486650928  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Four-color problem
<br/><br/><label>Dewey Class. No.: </label>511.56