WASET
    M. Challal and  F. Labu and  M. Dehmas and  A. Azrar,  Comparative Study of Three DGS Unit Shapes and Compact Microstrip Low-Pass and Band-Pass Filters Designs.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2011, vol. 59(11). 1486 - 1490
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/14959.