P. Mutzel, G.W. Klau:
"Automatic Layout and Labelling of State Diagrams";
in: "Mathematics - Key Technology for the Future", W. Jäger, H.-J. Krebs (ed.); Springer, Berlin, 2003, ISBN: 3-540-44220-0, 584 - 608.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404513