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2. ASTM D 6836 (2002) Standard test methods for determination of the soil water characteristic curve for desorption using a hanging column, pressure extractor, chilled mirror hygrometer, and/or centrifuge. ASTM International, West Conshohocken
3. ASTM D 5298 (2010) Standard test method for measurement of soil potential (suction) using filter paper. ASTM International, West Conshohocken
4. ASTM D 2487 (2011) Standard practice for classification of soils for engineering purposes (Unified Soil Classification System). ASTM International, West Conshohocken
5. Atkinson J (2007) The mechanics of soils and foundations. CRC Press, Cambridge