N. R. Harris and  J. Curry,  Development and Range Testing of a LoRaWAN System in an Urban Environment.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2018, vol. 133(1). 47 - 55
    [viewed 05 August 2020]. Available from: https://publications.waset.org/pdf/10008429.