4) Tsushima, M. and Mitachi, T.,″Method for predicting in-situ undrained strength of highly organic soil based on the value of suction and unconfined compressive strength″, International, Symposium on Problematic Soils, Vol.1, pp.11-14,(1998).
5) Tsushima, M., Mitachi, T., Oikawa, H. and Ogino, T., ″ Evaluation of the Effect of Ageing on Unconfined Compressive Strength of Highly Organic Soil Based on the Residual Effective Stress″, Proceedings of the GEOTECH - YEAR 2000, pp.107-114,(2000).