Muttaqin, A., Sakti, S. P., Naba, A., & Mudjirahardjo, P. (2026). Quartz Crystal Microbalance (QCM) Sensor Array with Varying PMMA Coatings for Coffee Roasting Aroma Monitoring. Indonesian Journal of Electrical Engineering and Informatics (IJEEI), 14(1), 153-166. https://doi.org/10.52549/ijeei.v14i1.7760