Hafifah, Ab Hamid, and Nayan Nazrul Anuar. “Methods of Extracting Feature from Photoplethysmogram Waveform for Non-Invasive Diagnostic Applications”. International Journal of Online and Biomedical Engineering (iJOE) 16, no. 09 (August 13, 2020): pp. 39–62. Accessed November 23, 2024. https://online-journals.org/index.php/i-joe/article/view/13577.