P.ARUNTHATHI; R.KEERTHANA; R.KIRUTHIKA; M.VENNKATESAN; GOBALAKRISHNAN. Automatic solar powered college bell system using GSM . International journal of intellectual advancements and research in engineering computations, [S. l.], v. 5, n. 2, p. 1238–1240, 2017. DOI: 10.61096/ijiarec.v5.iss2.2017.1238-1240. Disponível em: https://ijiarec.com/ijiarec/article/view/1673. Acesso em: 15 jun. 2026.