1. Aas, G. (1983), Stabilization of clay with hydroxy aluminium. In-situ determination of strength properties of stabilized columns, Nordic Seminar on Soil Stabilization, Esbo, Finland.
2. Aboshi, H. (1984), Soil improvement techniques in Japan, Proceedings,Seminar on Soil Improvement and Construction Techniques in Soft Ground, Singapore, pp. 3–16.
3. Ahnberg, H. and Holm, G. (1986), Kalkpelarmetoden (The lime column method), Swedish Geotechnical Institute, Report No. 31, Linköping, Sweden (in Swedish).
4. Ahnberg, H., Bengtsson, P.-E., and Hohn, G. (1989), Prediction of strength of lime columns, Proceedings of the 10th International Conference on Soil Mechanics and Foundation Engineering, Stockholm, 2, pp. 1327–1330.
5. Baguelin, F., Jezequel, J. F., and Shields, D. H. (1978), The Pressuremeter and Foundation Engineering. Trans Tech Publications, Clausthal, Germany.