WASET
    M. Arockia Jaswin and  D. Mohan Lal,  Impact Behavior of Cryogenically Treated En 52 and 21-4N Valve Steels.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 159 - 164
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/9997440.