Ahmad, Hussain, Mukhtiar Zaman, Rukhsana Javed Farooqi, and Saadia Ashraf. “Venous Vs Arterial Blood Gases in Acute Exacerbation of COPD”. Pakistan Journal of Chest Medicine 25, no. 4 (July 11, 2020): 146–150. Accessed March 10, 2026. https://pjcm.net/index.php/pjcm/article/view/646.