Yasin, M., Ahmad, W. ., Abbas, M., Ashraf, S. and Jan, F. (2024) “Correlation between FEV1 and Polycythemia in Chronic Obstructive Pulmonary Disease”, Pakistan Journal of Chest Medicine, 30(3), pp. 298–304. Available at: https://pjcm.net/index.php/pjcm/article/view/931 (Accessed: 17April2026).