Jawad Ahmad and  Hee-Jun Kim,  A Voltage Based Maximum Power Point Tracker for Low Power and Low Cost Photovoltaic Applications.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 2344 - 2347
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/9064.