1. A laboratory investigation into the effect of water content on the CBR of a subgrade soil;Ampadu,2007
2. Unsaturated soil mechanics: critical review of physical foundations;Baker;Eng Geol,2009
3. The principle of effective stress;Bishop;Tecknisk Ukeblad,1959
4. Methods of test for soils for civil engineering purposes;BS 1377,1990
5. Movement and distribution of water in relation to highway design and performance, Highway Research Board Special Report No. 40;Croney,1958