Sabur, F., and K. Atmia. “Design of Cigarette Smoke Detection in Smoking Rooms Not Smoking in the Airport Using Android Based Microcontroller”. Airman: Jurnal Teknik Dan Keselamatan Transportasi, vol. 2, no. 2, Dec. 2019, pp. 170-84, doi:10.46509/ajtk.v2i2.125.