Gulnaz, H. ., M. . Sardar, S. R. . Jafri, S. . Zakia, and K. . Saeed. “Investigating the Influence of Chronic Obstructive Pulmonary Disease Severity on the Thickness of the Diaphragm Muscle”. Pakistan Journal of Chest Medicine, vol. 30, no. 2, July 2025, pp. 203-10, http://www.pjcm.net/index.php/pjcm/article/view/964.