Avvaru Srinivasulu, Tanuja G, G Srujan, Jyothi Guna Sekhar, G Sai Kiran. “Physical Activity Indexing on Human ECG - A Biomarker for Clinical Diagnosis”. International Journal of Advanced Science and Technology, Vol. 29, no. 05, May 2020, pp. 5649 -60, http://sersc.org/journals/index.php/IJAST/article/view/15047.