Osama A. Terfas and  Abdusalam A. Alaktiwi,  Ductile Crack Growth in Surface Cracked Pressure Vessels.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 73(1). 46 - 52
    [viewed 22 February 2020]. Available from: https://publications.waset.org/pdf/10644.