Darajat, A. U., M. Q. N. Abdillah, F. A. Setyawan, and H. Fitriawan. “IoT-Based Indoor Localization of Cigarette Smoke Using K-Nearest Neighbor and MQ-7 Sensors”. ELECTRON Jurnal Ilmiah Teknik Elektro, vol. 7, no. 1, May 2026, pp. 30-37, doi:10.33019/electron.v7i1.505.