jaafar, sara, and Isredza Rahmi A. Hamid. “A Secured Clinic Booking System With Multi Factor Authentication”. Applied Information Technology And Computer Science 4, no. 2 (November 30, 2023): 15–29. Accessed April 7, 2026. https://penerbit.uthm.edu.my/periodicals/index.php/aitcs/article/view/10045.