Seow, Mei Kee, and Mohamed Sultan Mohamed Ali. “Carbon Dioxide and Carbon Monoxide Gas Detection System for Cars”. ELEKTRIKA- Journal of Electrical Engineering 20, no. 2-3 (October 15, 2021): 65–69. Accessed May 3, 2024. https://elektrika.utm.my/index.php/ELEKTRIKA_Journal/article/view/312.