V. Vishnu Sai Varma, M. S. Koushik, D. P. V. R. R. G. N. R. T. N. P. Y. H. (2020). Digital Notice Board using Raspberry PI. International Journal of Advanced Science and Technology, 29(3), 4429- 4437. Retrieved from https://sersc.org/journals/index.php/IJAST/article/view/5332