Sai Divya, M, and M Nagabhushana Rao. “Centralized Authentication Smart Locking System Using RFID, Fingerprint, Password and GSM”. International Journal of Engineering & Technology, vol. 7, no. 3.12, July 2018, pp. 516-20, https://doi.org/10.14419/ijet.v7i3.12.16170.