R. Ranjan, U. Singh, and D. P. Singh, “PHENOTYPES OF COPD PATIENTS WITH RESPIRATORY FAILURE AND THEIR RESULTS IN ICU SETUP: A CROSS-SECTIONAL OBSERVATIONAL STUDY”., SJHR-Africa, vol. 5, no. 3, p. 6, Mar. 2024, doi: 10.51168/sjhrafrica.v5i3.1107.