Graphtheoretic concepts in computer science :  proceedings of the international workshop WG 80, Bad Honnef, June 15-18, 1980 / 
edited by Hartmut Noltemeier. 
 - Berlin etc. :   Springer-Verlag,  1981. 
<br/><br/><label>ISBN: </label>0387102914 
<br/><br/><label>Universal Decimal Class. No.: </label>004