R. Subash, Yash Kumawat, Vignesh Sivarajan. “Smart Doorbell System With Facial Recognition for People With Hearing Impairment”. International Journal of Advanced Science and Technology 29, no. 06 (May 6, 2020): 2478 - 2486. Accessed October 10, 2026. http://sersc.org/journals/index.php/IJAST/article/view/13679.