V. B. . Patel, P. H. . Bhatt, N. V. . Rajguru, S. . Jindal, S. . Tripathi, and V. K. . Kapadia, “EFFECTIVENESS OF TRIPLE DRUG FIXED DOSE COMBINATION INHALED THERAPY IN SEVERE COPD PATIENTS”, Natl J Med Res, vol. 8, no. 01, pp. 21–24, Mar. 2018.