Amdan, Nor Hidayah, and Audrey Huong. “Development of a Low Cost and Portable Ventilator Prototype”. Evolution in Electrical and Electronic Engineering 2, no. 2 (November 14, 2021): 206–213. Accessed July 18, 2024. https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/4050.