Hamioud Saida and  Khalfallah Salah,  C Vibration Analysis of a Beam on Elastic Foundation with Elastically Restrained Ends Using Spectral Element Method.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2019, vol. 153(9). 600 - 604
    [viewed 18 November 2019]. Available from: https://publications.waset.org/pdf/10010766.