1. Benoist, T., Laburthe, F., & Rottembourg, B. (2001). Lagrange relaxation and constraint programming collaborative schemes for travelling tournament problems. In CP-AI-OR 2001 (pp. 15–26). Wye College, UK.
2. Dechter, R. (2003). Constraint processing. San Francisco: Morgan Kaufmann.
3. Easton, K., Nemhauser, G. L., & Trick, M. A. (2001). The traveling tournament problem: Description and benchmarks. In T. Walsh (Ed.), Lecture notes in computer science (Vol. 2239, pp. 580–584). Berlin: Springer.
4. Lecture notes in computer science;K. Easton,2003
5. Gschwind, T., & Irnich, S. (2011). A note on symmetry reduction for circular traveling tournament problems. European Journal of Operational Research, 210(2), 452–456.