1. Battista, G.D., Eades, P., Tamassia, R., Tollis, I.G.: Graph Drawing: Algorithms for the Visualization of Graphs. Prentice-Hall, Englewood Cliffs (1999)
2. Harel, D., Koren, Y.: Drawing graphs with non-uniform vertices. In: Proceedings of the Working Conference on Advanced Visual Interfaces (AVI 2002), pp. 157–166. ACM Press, New York (2002)
3. Friedrich, C., Schreiber, F.: Flexible layering in hierarchical drawings with nodes of arbitrary size. In: Proceedings of the 27th conference on Australasian computer science (ACSC 2004), vol. 26, pp. 369–376. Australian Computer Society (2004)
4. Marriott, K., Moulder, P., Hope, L., Twardy, C.: Layout of bayesian networks. In: Twenty-Eighth Australasian Computer Science Conference (ACSC 2005). CRPIT, vol. 38, pp. 97–106. Australian Computer Society (2005)
5. Misue, K., Eades, P., Lai, W., Sugiyama, K.: Layout adjustment and the mental map. Journal of Visual Languages and Computing 6, 183–210 (1995)