B. A. Shah, H. K. . Shrivastava, A. . Julka, M. . Dubey, and S. . Mishra, “Evaluation of respiratory Failure in Patients with Chronic Obstructive Pulmonary disease ”, CIJMR, vol. 1, no. 01, Jun. 2022, doi: 10.58999/cijmr.v1i01.31.