8Alonso E,Gens A,Lioret A,Delahaye C. Effect of Rain Infiltration on the Stability of Slopes [J]. Unsaturated Soils, 1995 ( 1 ) .. 241 - 249.
9Ng C W W, Member, ASCE, Pang Y W. Influence of Stress State on Soil-Water Characteristic and Slope Stability[J]. Journal of Geotechnical and Geoenvironmental engineering, 2000, (2): 157- 166.