GOVARDHANI. IMMADI, M. VENKATA NARAYANA, A. SREE MADHURI, M. MOUNIKA, P. JYOTHIRMAYEE, K. GEETHASREE. Implementation of Digital Code Lock with Emergency Alarm System. International Journal of Advanced Science and Technology, v. 29, n. 05, p. 8345-8350, 27 May 2020.