WASET
    Zi-Gui Huang and  Tsung-Tsong Wu,  Analysis of Wave Propagation in Two-dimensional Phononic Crystals with Hollow Cylinders.   journal   = {International Journal of Mechanical and Mechatronics Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 509 - 513
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10607.