Kayode, M. ., S. A. . Man, and O. B. . Oluwabunmi. “Design of a Microcontroller Based Electronics Billboard Using GSM”. International Journal of Innovative Analyses and Emerging Technology, vol. 2, no. 7, July 2022, pp. 21-28, https://openaccessjournals.eu/index.php/ijiaet/article/view/1494.