Bang-Jensen,Jorgon <br/><br/>
Digraphs: theory, algorithms and applications 

 - 2nd ed. 
 - London  springer  2009 
 - xxii,795p.  HB  24cm. 
 - Springer Monographs in Mathematics .
<br/><br/><label>ISBN: </label>9781848009974 
<br/><br/><label>Dewey Class. No.: </label>511.54  / BAN