WASET
    Aye Sandar Win,  Design and Construction of Microcontroller-Based Telephone Exchange System.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 2113 - 2119
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/3916.