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Jiang, J.C., R. Baker and T. Yamagami, 2003. The effect of strength envelope nonlinearity on slope stability computations. Can. Geotech. J., 40: 308-325.
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Mello, D.V.F.B., 1977. Reflections on design decisions of practical significance to embankment dams. Geotech., 27: 281-355.
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Noor, M.M. and W.F. Anderson, 2006. A comprehensive shear strength model for saturated and unsaturated soils. Proceedings of the 4th International Conference on Unsaturated Soils 2006, April 2-6, 2006, ASCE, Reston, Virginia, pp: 1992-2003.

Noor, M.M.J. and B.A. Hadi, 2010. The significance of curved shear strength envelope in modelling rainfall induced shallow failure of slopes. Proceedings of the 5th International Conference on Unsaturated Soils, September 6-8, 2010, Universiti Teknologi MARA, Barcelona, Spain, pp: 1261-1265.