Yee Fei, Ng, and Chandra Reka Ramachandiran. “Facial Recognition Payment System: An Effortless Payment Method in Public Transport Sector”. International Journal of Psychosocial Rehabilitation 23, no. 4 (October 31, 2019): 1424–1433. Accessed April 3, 2025. https://psychosocial.com/PSY/index.php/ijpr/article/view/3907.