1. D. Bjørner, C.W. George, B. Stig Hansen, H. Laustrup, and S. Prehn. A railway system, coordination’97, case study workshop example. Technical Report 93, UNU/IIST, P.O.Box 3058, Macau, 1997.
2. B. Dehbonei and F. Mejia. Formal development of safety-critical software systems in railway signalling. In M. G. Hinchey and J. P. Bowen, editors, Applications of Formal Methods, pages 227–252. Prentice Hall Int., 1995.
3. Regionalstrecken. (De Eisenbahntechnische Rundschau (ETR)) 46 (1997), Heft 6, 323–331.
4. PhD thesis;K. Mark Hansen,1996
5. K. Mark Hansen. Formalising railway interlocking systems. In Procedings of Second FMERail Workshop, October 1998.