GSM Based Smart Digital Wireless Electronic Notice Board. Journal of Information Technology and Digital World, [S. l.], v. 4, n. 3, p. 144–152, 2022. DOI: 10.36548/jitdw.2022.3.002. Disponível em: https://irojournals.com/itdw/article/view/1341. Acesso em: 18 mar. 2026.