Varghese, Anne, Gnanaseelan Kanakamma Libu, and Natesan Sudhya Kumar. 2015. “A Physiological Assessment of Mean QRS Axis in an Indian Sub-Population Using Two Methods of Axis Calculation”. International Journal of Clinical and Experimental Physiology 2 (2), 115-18. https://ijcep.org/index.php/ijcep/article/view/68.