Implementation of Attendance System based on RFID and GSM with respect to Power Saving Concept. International Journal of Current Engineering and Technology, [S. l.], v. 6, n. 2, p. 539–541, 2016. DOI: 10.14741/. Disponível em: https://ijcet.evegenis.org/index.php/ijcet/article/view/2720. Acesso em: 11 apr. 2026.