Khatami, Mokhammad, Agus Sujatmiko, and Asrori Asrori. 2023. “An Analysis of Emission Exhaust Gas on 4-Stroke Engine Based on IOT Gas Analyzer”. Logic : Jurnal Rancang Bangun Dan Teknologi 23 (2):104-10. https://doi.org/10.31940/logic.v23i2.104-110.