√örsula B. Ferraz and  Paulo F. Seixas and  Webber E. Aguiar,  A Simplified Model for Mechanical Loads under Angular Misalignment and Unbalance.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 1611 - 1617
    [viewed 23 September 2019]. Available from: https://publications.waset.org/pdf/16567.