WASET
    Neil Bar and  Andrew Heweston,  Considerations for Effectively Using Probability of Failure as a Means of Slope Design Appraisal for Homogeneous and Heterogeneous Rock Masses.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 134(2). 66 - 72
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10008496.