Naps, Thomas L. and Lucas, Jeff and Rößling, Guido (2003):
VisualGraph : a graph class designed for both undergraduate students and educators.
In: SIGCSE Technical Symposium on Computer Science Education <34, 2003, Reno, Nev.>: Proceedings, Reno, Nevada, USA, February 19 - 22, 2003 / SIGCSE 2003. Symposium chair: Scott Grissom.- New York, NY : Association for Computing Machinery, 2003.- XXIII, 420 S, New York, NY, Association for Computing Machinery, [Conference or Workshop Item]

Lucas, Jeff and Naps, Thomas and Rößling, Guido (2003):
VisualGraph: A graph class designed for both undergraduate students and educators.
In: Proceedings of the 34th SIGCSE Technical Symposium on Computer Science Education (SIGCSE) 2003, ACM Press, pp. 167-171, [Conference or Workshop Item]