SHERIF KAMEL HUSSEIN. A Microcontroller Based Smart Helmet Using GSM &GPS Technology in Construction Sites. International Journal of Computer Engineering in Research Trends, [S. l.], v. 5, n. 2, p. 65–71, 2018. Disponível em: https://www.ijcert.org/index.php/ijcert/article/view/489. Acesso em: 14 may. 2026.