1. Burland JB (1990) On the compressibility and shear strength of natural clays. Géotechnique 40(3):329–378
2. Tsuchida T (1991) A new concept of e-LogP relationship for clays. In: Proceedings 9th Asian regional Conference on soil mechanics and foundation Engineering, Bangkok, vol 1, pp 87–90
3. Bowles JE (1989) Physical and geotechnical properties of soils. McGraw-Hill Book Company Inc., New York
4. Nath A, DeDalal S (2004) The role of the plasticity index in predicting compression behaviour of clays. J Geotech Eng EJGE, 9: 1–7
5. Park JH, Koumoto T (2004) New compression index equation. ASCE J Geotech Geoenviron Eng 130(2):223–226