Khan, P. A., A. Sujala, B. B. S. Nousheen, A. F. Fatima, H. T. Ala, and A. B. T. P. Reddy. “A COMPARATIVE EVALUATION OF THE EFFICACY OF TRIPLE DRUG THERAPY WITH DUAL DRUG THERAPY IN COPD PATIENTS”. International Journal of Pharmacy and Pharmaceutical Sciences, vol. 10, no. 4, Apr. 2018, pp. 105-9, doi:10.22159/ijpps.2018v10i4.24529.