1. Chahal, N., and D. deWerra. An interactive system for constructing timetables on a PC. European Journal of Operational Research, 40 (1), 1989.
2. Davis, L., and F. Ritter. Schedule optimization with probabilistic search. Proc. 3rd IEEE Conference on Artificial Intelligence Applications, Orlando, Florida, February 1987.
3. De Jong, K. A.,and W. M. Spears. Using genetic algorithms to solve NP-complete problems. Proc. 3rd Int. Conference on Genetic Algorithms and Their Applications, George Mason University, June 1989.
4. M. Dorigo. Genetic algorithms:The state of the art and some research proposal. Technical Report No. 89–058, Polytecnico di Milano, Italy, 1989.
5. Even, S., A. Itai, and A. Shamir. On the complexity of timetable and multicommodity flow problems. SIAM Journal of Computing, 5 (4), December 1976.