H. M. Mobarak and  Helen Wu and  Keqin Xiao ,  Numerical Analysis of Effect of Crack Location on the Crack Breathing Behavior.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2017, vol. 132(12). 1861 - 1865
    [viewed 22 September 2019]. Available from: https://publications.waset.org/pdf/10008268.