1. The Open Graph Drawing Framework,
http://www.ogdf.net
2. The AT&T graph library,
http://www.graphdrawing.org
.
3. Battista, G.D., Eades, P., Tamassia, R., Tollis, I.G.: Graph Drawing. Prentice-Hall, Englewood Cliffs (1999)
4. Lecture Notes in Computer Science;F.J. Brandenburg,1996
5. Lecture Notes in Computer Science;U. Brandes,2009