Ľubomír Gajdoš and  Martin Šperl,  Application of a Fracture-Mechanics Approach to Gas Pipelines.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2011, vol. 49(1). 67 - 74
    [viewed 28 November 2021]. Available from: https://publications.waset.org/pdf/10332.