POOBALAN, B. .-.; MAT RABI, A. M. F.; ABDUL HAMID, H.; SHING FHAN, K. The design model of solar powered automatic bell system integrated with smoke detection for educational institution application. International Journal of Electrical Engineering and Applied Sciences (IJEEAS), [S. l.], v. 1, n. 2, p. 21–26, 2018. Disponível em: https://ijeeas.utem.edu.my/ijeeas/article/view/4447. Acesso em: 25 apr. 2024.