D. Sudeena, S.B. Lal, and Kattamuri. Ramesh Kumar. “Profile of Bacterial Culture and Sensitivity from the Sputum of Chronic Obstructive Pulmonary Patients With Acute Exacerbations”. Asian Pacific Journal of Health Sciences, vol. 4, no. 1, Mar. 2017, pp. 173-82, doi:10.21276/apjhs.2017.4.1.28.