B. Tomczyk and  R. Mania,  Parametric Vibrations of Periodic Shells.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 2187 - 2196
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/5805.