1. Buckling of pressure shaft and tunnel linings;Amstutz;Water Power,1970
2. Geomechanics classification of rock masses and its application in tunnelling;Bieniawski,1974
3. Design guidelines for pressure tunnels and shafts;Brekke;EPRI Document RE-1745-17,1987
4. Unlined high pressure tunnels in areas of complex topography;Broch;Water Pwr Dam Construction,1984
5. Unique geotechnical problems at some hydroelectric projects;Deere,1983