James Kuria and  John Kihiu,  Prediction of Overall Efficiency in Multistage Gear Trains.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 300 - 306
    [viewed 28 May 2022]. Available from: https://publications.waset.org/pdf/10930.