WASET
    M. M. Toufigh and  A. R. Ahangarasr and  A. Ouria,  Using Non-Linear Programming Techniques in Determination of the Most Probable Slip Surface in 3D Slopes.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2008, vol. 17(5). 98 - 103
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/11907.