Pandi, and Tomy Abuzairi. “Effect of Filters in Photoplethysmography Analog Signals Using Open-Source LTspice Software”. International Journal of Electrical, Computer, and Biomedical Engineering 2, no. 1 (March 30, 2024): 88–100. Accessed November 24, 2024. https://ijecbe.ui.ac.id/go/article/view/32.