Boutahar Lhoucine and  El Bikri Khalid and  Benamar Rhali,  Geometrically Non-Linear Axisymmetric Free Vibrations of Thin Isotropic Annular Plates.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2013, vol. 81(9). 1887 - 1893
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/17346.