1. Davik, K.I., 1999. Cost efficient water and frost protection systems in Norwegian road tunnels. Proceedings of the Third International Symposium on Sprayed Concrete, Gol, Norway. pp. 172–181
2. Grønhaug, A., 1999. Lining designs for Norwegian road tunnels. Challenges for the 21st Century. Balkema, Rotterdam, pp. 347–352.
3. NPRA, 1990. Norwegian Design Guide Road Tunnels, 127 p.
4. NPRA, 1995. Water and frost protection of road tunnels—functional requirements and design regulations. Handbook no.163. 31 p (in Norwegian).
5. NPRA, 1998. Water and frost protection systems. Publication no. 91. 65 p (in Norwegian).