1. Andresen, A. and P. Kolstad. (1979). The NGI 54-mm samplers for undisturbed sampling of clays and representative sampling of coarser materials. Proc. Intl. Symp. on Soil Sampling, Singapore, pp. 1-9.
2. Leroueil, S. (1999). Geotechnical characteristics of eastern Canadian clay. In Characterization of Soft Marine Clays, edited by Tsuchida T. and A. Nakase, Balkema, pp. 3-32.
3. Tanaka, H., O. Mishima, M. Tanaka, S. Z. Park, and G. H. Jeoung. Consolidation charateristics of Nakdong river clay deposits, KGS '99 Dredging on Geoenvironmental Conference, Nov. 2, Seoul, South Korea, pp. 3-11.