Merzagora, Eugenio A.; Lotsberg, Gunnar (eds.). "Road Tunnels in Norway > 3 000 m". Road Tunnels in Norway. Archived from the original on 2012-02-24. Retrieved 2013-02-11.
Merzagora, Eugenio A.; Lotsberg, Gunnar (eds.). "Road Tunnels in Norway > 3 000 m". Road Tunnels in Norway. Archived from the original on 2012-02-24. Retrieved 2013-02-11.