D. Satria, S. Safrina Dewi, Z. ., E. Yusibani, and D. Sugiyanto, “Implementation of Wireless Sensor Network on Fire Early Warning System Using GSM Communication”, IJET, vol. 7, no. 4, pp. 6069–6071, May 2019, doi: 10.14419/ijet.v7i4.20665.