1. Proceedings of the Second International Symposium on the Aerodynamics and Ventilation of Vehicle Tunnels, Cmabridge, March 1976.
2. Fire Prevention No. 197, March 1987, P. 17.
3. British Standard BS5588, British Standards Institution, 1983, 1985.
4. 5th International Symposium on the Aerodynamics and Ventilation of Vehicle Tunnels. Lille, France, May 1985.
5. Tunnels and Tunnelling, January 1973, P. 73.