WASET
    T. Penchev and  D. Karastoyanov,  Experimental Study of Upsetting and Die Forging with Controlled Impact.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 88(4). 695 - 699
    [viewed 27 April 2024]. Available from: https://publications.waset.org/pdf/9997966.