1. K.-F. Boehringer, and F. N. Paulisch Using Constraints to Achieve Stability in Automatic Graph Layout Algorithms, ACM CHI’ 90 Proceedings, pp. 43–51.
2. A. Borning, The Programming Language Aspects of ThingLab, a Constraint-Oriented Simulation Laboratory, ACM Transactions on Programming Languages and Systems, 3(4), pp. 252–387, 1981.
3. G. D. Battista, P. Eades, R. Tomassia, and I. G. Tollis, Graph Drawing: Algorithms for the Visualization of Graphs, Prentice Hall, 1999.
4. P. Eades and D. Kelly, Heuristics for Reducing Crossings in 2-Layered Networks, Ars Combin., 21.A, 89–98, 1986.
5. P. Eades, W. Lai, K. Misue, and K. Sugiyama, Preserving the Mental Map of a Diagram, Proceedings Compugraphics’ 91, pp. 24–33, 1991.