Mokhtar, Nur Raudatusyahirah, and Mohd Kamarulzaki Mustafa Mustafa. “The Investigation of QCM-Based VOCS Gas Sensor Sensitivity Using Impedance Analysis”. Enhanced Knowledge in Sciences and Technology, vol. 5, no. 2, Dec. 2025, pp. 293-9, https://penerbit.uthm.edu.my/periodicals/index.php/ekst/article/view/18621.