Child Guard System: A Cross-Platform Mobile Child Monitoring System Using Global Positioning System Tracking, Geofencing, and Firebase Cloud Messaging. UHD J SCI TECH [Internet]. 2026 Jul. 19 [cited 2026 Oct. 25];10(2):31-4. Available from: https://journals.uhd.edu.iq/index.php/uhdjst/article/view/1826