Humagain, S, S Keshari, R Gurung, P Pant, B Pokharel, R Koju, and TRS Bedi. “Electrocardiographic Changes in Chronic Obstructive Pulmonary Disease Patients With Elevated Pulmonary Artery Systolic Pressure”. Nepalese Heart Journal 8, no. 1 (July 21, 2013): 12–15. Accessed May 7, 2024. https://www.nepjol.info/index.php/NHJ/article/view/8330.