1. Some Swedish experience of longevity of rock support in sub sea tunnels;Andersson,2001
2. Tunnelling through frozen soil at 120m water pressure, The Oslofjord challenge;Backer;Tunnels and Tunnelling,1999
3. Proposed tunnel Hareid-Sula: is a sub sea tunnel down to 630mbsl. feasible?;Beitnes,1994
4. Contract suitability – unit or fixed price;Blindheim;Tunnels and Tunnelling International,2003
5. Rock cover requirements for subsea road tunnels;Blindheim,2001