WASET
    A. Tavangari and  N. Salehzadeh,  Obtain the Stress Intensity Factor (SIF) in a Medium Containing a Penny-Shaped Crack by the Ritz Method.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2014, vol. 93(9). 1596 - 1599
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/9999365.