1) Hashiguchi, K. and Chen, Z. P.: Elastoplastic constitutive equation of soils with the subloading surface and the rotational hardening. Int. J. Numer. Anal. Methods Geomech., Vol. 22, pp. 199-227, 1998
2) Asaoka, A., Nakano, M. and Noda, T.: Soil-water coupled Behavior of saturated clay near/at critical state, Soils and Foundations, 34 (1), pp. 91-105, 1994
3) Ishihara, K. Tatsuoka, F. and Yasuda, S. (1975): Undrained deformation and liquefaction of sand under cyclic stresses. Soils and Foundations, Vol. 15, pp. 29-44, 1975