Susanto, Fredy, and Syafnidawati Syafnidawati. “Fast Tracking of Detection Offenders Smoking Zone Menggunakan Sensor MQ-2 Berbasis Internet of Things”. Ultima Computing : Jurnal Sistem Komputer 10, no. 1 (July 6, 2018): 5 - 8. Accessed April 18, 2024. https://ejournals.umn.ac.id/index.php/SK/article/view/749.