1. Garga VK (1970) Residual shear strength under large strains and the effect of sample size on the consolidation of fissured clay, PhD thesis, University of London
2. Lupini JF, Skinner AE, Vaughan PR (1981) The drained residual strength of cohesive soils. Geotechnique 31(2):181–213
3. MLIT (Ministry of Land, Infrastructure and Transport) (1997) Landslides in Japan. A booklet published by Sabo Publicity Center, Slope Conservation Division
4. Skempton AW (1985) Residual strength of clays in landslides, folded strata and the laboratory. Geotechnique 35(1):3–18
5. Yagi N, Enoki M, Yatabe R (1990) Consideration on mechanical characteristics of landslide clay. In: Bonnard C (ed) Landslides. Proc. the Fifth Int. Symp. on Landslides, 10–15 Jul. 1988, vol. 1, pp 361–364