1. Cheng, Y.M., Liu, H.T., Wei W.B., and Au, S.K. 2005. Location of critical three-dimensional non-spherical failure surface by NURBS functions and ellipsoid with applications to highway slopes. Comput Geotech. 32(6): 387–399.
2. Jiang, J.C., Yamagami, T., and Baker, R. 2003. Three-dimensional slope stability analysis based on nonlinear failure envelope. Chinese J Rock Mech and Eng, 22(6): 1017–1023.
3. Kalatehjari, R., A Rashid, A. S., Ali, N., and Hajihassani, M. 2014. The contribution of particle swarm optimization to three-dimensional slope stability analysis. The Scientific World Journal.
4. Kalatehjari, R., Ali, N., Hajihassani, M., and Fard M.K., 2012. The application of particle swarm optimization in slope stability analysis of homogeneous soil slopes. International Review on Modelling and Simulations, 5(1): 458–65.
5. Ma, T., Mafi, R., Cami, B., Javankhoshdel, S., Gandomi, A.H. (2022). NURBS surface-altering optimization for identifying critical slip surfaces in 3D slopes. Int. J. Geomech.