1. ASTM, 2000. Annual Book of ASTM Standards. American Society for Testing and Materials, West Conshohocken, PA.
2. Brackley, I.J.A., 1975. Swell Under Load. Proceeding of 6th Region Conference for Africa SMFE, 1:65–70.
3. Gens, A., Alonso, E.E., 1992. A framework for the behavior of unsaturated expansive clays. Canadian Geotechnical Journal, 29:1013–1032.
4. Hillel, D., 1998. Environmental Soil Physics. Academic Press, San Diego, CA, USA.
5. Liu, T.H., 1997. Problems of Expansive Soils in Engineering Construction. Architecture and Building Press of China, Beijing (in Chinese).