References
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- Arild Palmstrom, 1996, Engineering Geology and rock engineering applied i the design of Norwegian tunnels, Conference on Tunnels for the third Millennium, Prievidza, Slovakia.
- Eivind Grov, 2009, Conventional methods of construction, Workshop of "Underground structures in hot climate condtions", Ministry of Transportation December, Riyadh, Saudi Arabia.
- Norwegian tunnelling technology, 2014, Norwegian tunnelling society, Publication No. 23.
- Shani Walls, 2010, Links across the waters, Strait crossings conference report.