H. Dehghan and  E. Mahdavi and  M. M. Heyhat,  Hydrogen Embrittlement in a Coupled Mass Diffusion with Stress near a Blunting Crack Tip for AISI 4135 Pressure Vessel.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 437 - 444
    [viewed 24 January 2021]. Available from: https://publications.waset.org/pdf/1142.