James Kuria and  John Kihiu,  Modeling Parametric Vibration of Multistage Gear Systems as a Tool for Design Optimization.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2008, vol. 14(2). 217 - 224
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/1259.