Ghanbari, Atefeh, Nasim Shirmohamadi, Ezzat Paryad, Milad Bazghale, and Reza Mohammadpourhodki. 2018. “Effect of Breathing Exercises on Fatigue Dimensions in Patients With COPD”. Medical Science and Discovery 5 (4):174-79. https://medscidiscovery.com/index.php/msd/article/view/232.