1. Skempton AW The φ = 0 analysis for stability and its theoretical basis 1948
2. Stability evaluations during stage construction;Ladd;Journal of Geotechnical Engineering,1991
3. Bjerrum L Problems of soil mechanics and construction on soft clays 111 159
4. Jamiolkowsi M Ladd CC Germaine J Lancellotta R New developments in field and lab testing of soils 1985 57 154
5. Seah TH Anisotropy of normally consolidated Boston blue clay 1990