Ahmad, H., Zaman, M., Farooqi, R. J. and Ashraf, S. (2020) “Venous vs Arterial Blood Gases in Acute Exacerbation of COPD”, Pakistan Journal of Chest Medicine, 25(4), pp. 146–150. Available at: https://pjcm.net/index.php/pjcm/article/view/646 (Accessed: 10March2026).