Gunastuti, Dwi Anie, M. M. Lanny, W. Panjaitan, and Lukas Lukas. “Design and Implementation of a Negative Ion Generator Based on MQ-135 Sensor and Arduino Nano”. Emitor: Jurnal Teknik Elektro 25, no. 3 (November 13, 2025): 318–323. Accessed November 21, 2025. http://journals2.ums.ac.id/emitor/article/view/13673.