1. Bruzelius, N., Jensen, A., Sjostedt, L., 1994. Swedish railway policy: a critical study. Department of Transportation and Logistics, Chalmers University of Technology, Goteborg
2. Dodgson, J., 1995. Separating railway infrastructure and operations: the British experience. In: Fourth International Conference on Competition and Ownership in Land Passenger Transport. Rotorua, New Zealand
3. Planning single track rail operations: an overview;Ferreira;Transportation Research Part A,1997
4. Rail track infrastructure ownership: investment and operational issues;Ferreira;Transportation,1997
5. Han, B.M., 1997. L'optimisation de la planification et d'exploitation d'un réseau ferroviaire à grande vitesse, Ph.D. thesis, Liege University, Belgium