V. K. Nelson and  S. Karthikeyan,  Axisymmetric Vibration of Pyrocomposite Hollow Cylinder.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2008, vol. 13(1). 9 - 15
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/12647.