WASET
    M. H. Pol and  A. Bidi and  A. V. Hoseini,  Estimation of Natural Frequency of the Bearing System under Periodic Force Based on Principal of Hydrodynamic Mass of Fluid.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 835 - 839
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/3170.