Chinju Antony. 2020. “Comparison of the Effectiveness of Inhaled Short-Acting ?2 Agonist and Anti-Cholinergic With and Without Inhaled Corticosteroid in Improving the Pulmonary Function in COPD Patients”. International Journal of Allied Medical Sciences and Clinical Research 6 (4):902-13. https://doi.org/10.61096/ijamscr.v6.iss4.2018.902-913.