Vu Ngoc Pi,  A Study on Optimal Determination of Partial Transmission Ratios of Helical Gearboxes with Second-Step Double Gear-Sets.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2008, vol. 13(1). 26 - 29
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/8837.