Omid A. Zargar,  Vibration, Lubrication and Machinery Consideration for a Mixer Gearbox Related to Iran Oil Industries.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2014, vol. 87(3). 547 - 553
    [viewed 18 October 2019]. Available from: https://publications.waset.org/pdf/9997675.