Khaled A. Madi,  Precision Control of Single-Phase PWM Inverter Using M68HC11E Microcontroller.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2013, vol. 76(4). 486 - 489
    [viewed 09 December 2019]. Available from: https://publications.waset.org/pdf/6698.