AK Agarwal, and Satyendra Kumar Gahlot. “Predictors of Mortality in Acute Exacerbation of Chronic Obstructive Pulmonary Disease”. International Journal of Health and Clinical Research 5, no. 1 (January 16, 2022): 528–531. Accessed December 14, 2025. https://ijhcr.com/index.php/ijhcr/article/view/4650.