F.H.Wee and  F. Malek,  Design and Development of Ferroelectric Material for Microstrip Patch Array Antenna.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2012, vol. 62(2). 188 - 191
    [viewed 23 May 2022]. Available from: https://publications.waset.org/pdf/6134.