WASET
    Yuji Kotani and  Shunsuke Kanai and  Hisaki Watari,  Characteristics of Wall Thickness Increase in Pipe Reduction Process using Planetary Rolls.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 2378 - 2382
    [viewed 28 March 2024]. Available from: https://publications.waset.org/pdf/13024.