AHMED, Z. N.; KHEDER, M. Q. Child Guard System: A Cross-Platform Mobile Child Monitoring System Using Global Positioning System Tracking, Geofencing, and Firebase Cloud Messaging. UHD Journal of Science and Technology, [S. l.], v. 10, n. 2, p. 31–41, 2026. DOI: 10.21928/uhdjst.v10n2y2026.pp31-41. Disponível em: https://journals.uhd.edu.iq/index.php/uhdjst/article/view/1826. Acesso em: 27 jul. 2026.