Majumder, Md Mahabubul Islam, et al. “Bacteriology and Antibiotic Sensitivity Pattern of Sputum in Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease”. Medicine Today, vol. 34, no. 1, Apr. 2022, pp. 12-16, doi:10.3329/medtoday.v34i01.58632.