1. Methods of locating slip surfaces in landslides;Hutchinson;Bulletin of the Association of Engineering Geologists,1983
2. Landslide types and processes;Varnes,1958
3. Ground movement types and processes;Varnes,1978
4. The landslide at Surte on the Gota river;Jakobson,1952
5. Field and laboratory investigations;Philbrick,1958