1. Borda, O., Uno, M., Towhata, I., 2007. Shaft capacity of nodular piles in loose sand. Proceedings of the 49th National Conference, Japanese Geotechnical Society, Japan, 2:1175–1176 (in Japanese).
2. Butterfield, R., Banerjee, P.K., 1971. The problem of pile group-pile cap interaction. Géotechnique, 21(2):135–142. [doi:10.1680/geot.1971.21.2.135]
3. Chow, Y.K., Teh, C.I., 1991. Pile-cap–pile-group interaction in non-homogeneous soil. Journal of Geotechnical Engineering, 117(11):1655–1668. [doi:10.1061/(ASCE)0733-9410(1991)117:11(1655)]
4. Cooke, R.W., 1986. Piled raft foundations on stiff clays—a contribution to design philosophy. Géotechnique, 36(2): 169–203. [doi:10.1680/geot.1986.36.2.169]
5. Horiguchi, T., Karkee, M.B., 1995. Load tests on bored PHC nodular piles in different ground conditions and the bearing capacity based on simple soil parameters. Proceedings of Technical Report of Japanese Architectural Society, 1:89–94 (in Japanese).