Dr. Rakesh Kumar Shahi, Dr. Rajendra Rai, and Dr. P Nigam. 2020. “Electrocardiographic Findings and Its Comparison With Chronic Obstructive Pulmonary Disease Severity In Patients: A Prospective Study: Electrocardiographic Findings And Its Comparison With COPD Severity In Patients”. National Journal of Integrated Research in Medicine 11 (4):15-18. http://nicpd.ac.in/ojs-/index.php/njirm/article/view/2852.