Dr. A. Prema, E. Manjula,. “An Implementation of Pre-Processing Model for PPG, ECG, EEG & Heart Rate Signals Using Multinominal Logistic Regression Algorithm.”. Design Engineering (July 28, 2021): 5335- 5343. Accessed May 6, 2024. http://thedesignengineering.com/index.php/DE/article/view/2985.