Warkar, D. A. B., and D. A. Gawarle. “A Study of Electrocardiographic and Echo-Cardio Graphic Adaptive Changes in Endurance Athletes: A Study Of Electrocardiographic And Echo-Cardio Graphic”. National Journal of Integrated Research in Medicine, vol. 5, no. 4, Jan. 2018, pp. 52-56, http://nicpd.ac.in/ojs-/index.php/njirm/article/view/768.