Merzagora, Eugenio A.; Lotsberg, Gunnar (eds.). "Road Tunnels in Norway 3 000 - 2 000 m". Road Tunnels in Norway. Archived from the original on 2013-11-01. Retrieved 2013-10-16.
Merzagora, Eugenio A.; Lotsberg, Gunnar (eds.). "Road Tunnels in Norway 3 000 - 2 000 m". Road Tunnels in Norway. Archived from the original on 2013-11-01. Retrieved 2013-10-16.