Proof techniques in graph theory :  proceedings of graph theory conferenc held at Hungary, February 2, 1968 / 
edited by Frank Harary 
 - New York :  Academic Press,  c1969 
 - xv, 330 p. :  ill. ;  25 cm. 
<br/><br/><label>ISBN: </label> USD 14.50 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Graph theory--Congresses
<br/><br/><label>Dewey Class. No.: </label>512.5