Mr. Khalid I. Saad and  Ms. Nusrat Afrin and  Mr. Rajib Mikail,  Design and Implementation of a Microcontroller Based LCD Screen Digital Stop Watch.   journal   = {International Journal of Electrical and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 183 - 187
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/15725.