Salamah, Umi, Qonitatul Hidayah, and Damar Yoga Kusuma. “CO2 Detection System in Mixed Gas Using MQ-135 Sensor”. Newton-Maxwell Journal of Physics 2, no. 2 (January 6, 2022). Accessed April 22, 2025. https://ejournal.unib.ac.id/nmj/article/view/18730.