1. Rock mechanics investigations for unlined pressure tunnels and air cushion surge chambers;Barton,1987
2. A review of the shear strength of filled discontinuities in rock;Barton,1973
3. Design of unlined and lined pressure tunnels;Benson;Tunnelling and Underground Space Technology,1989
4. Engineering geological evaluations of the unlined pressure shaft at the Mauranger hydropower plant;Bergh-Christensen,1971
5. Investigations for a 1000 m head unlined pressure shaft at the Nyset/Steggje project, Norway;Bergh-Christensen,1982