Cem Mutlu, Levent, Suleyman Savas Hacievliyagil, Hakan Gunen, and Ozkan Kizkin. “The Effect of Supplemental Oxygen on Hypoxemia and Hypercapnia in COPD Patients With Acute Respiratory Failure”. Annals of Medical Research 13, no. 4 (May 25, 2021): 0231–0236. Accessed May 20, 2024. http://www.annalsmedres.org/index.php/aomr/article/view/3412.