1. Applegate, D. L., R. E.Bixby, V.Chvatal, and W. J.Cook. 2006. The Travelling Salesman Problem: A Computational Study. Princeton and Oxford: Princeton University Press and Oxford University Press.
2. Chopra, S., and P.Meindel. 2001. Supply Chain Management – Strategy, Planning and Operation. Upper Saddle River, NJ: Prentice-Hall.
3. Dapiran, A., and M. Manieri. 1983. “The Cost of Flexibility in the FMS.” Proceedings of the Second International Conference on FMS. London. October 26–28.