WASET
    M. Jahanandish and  M. B. Zeydabadinejad,  Influence of Intermediate Principal Stress on Solution of Planar Stability Problems.   journal   = {International Journal of Geological and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2015, vol. 108(12). 1368 - 1372
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10003155.