1. Bowyer A: Computing Dirichlet tesselation. Comput J, 24: 162–166, 1981.
2. Preparata FP, Shamos MI: Computational geometry. Springer-Verlag, 1985.
3. Toussaint GT: Pattern recognition and geometrical complexity. In: Proceedings 5th International Conference on Pattern Recognition, IEEE Catalog NO. 80CH1499-3, Miami Beach 1980, pp. 1324–1347.
4. Ulam S: Patterns of growth of figures: mathematical aspects. Proceedings of symposia in applied mathematics, XIV: Mathematical problems in the biological sciences, American Mathematical Society. 64–75, 1962.