Taegyoo Woo and  Jong Kang Park and  Jong Tae Kim,  Effects of Incident Angle and Distance on Visible Light Communication.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2017, vol. 121(1). 70 - 73
    [viewed 14 July 2020]. Available from: https://publications.waset.org/pdf/10006289.