Tlotlollo Sidwell Hlalele and  Shengzhi Du,  Radio Technology Frequency Identification Applied in High-Voltage Power Transmission- Line for Sag Measurement.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2013, vol. 79(7). 928 - 932
    [viewed 09 December 2019]. Available from: https://publications.waset.org/pdf/16480.