The Nan Chang and  Ping-Tang Yu and  Jyun-Ming Lin ,  Proximity-Inset Fed Triple Band Antenna for Global Position System with High Gain.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2018, vol. 137(5). 352 - 355
    [viewed 12 August 2020]. Available from: https://publications.waset.org/pdf/10008885.