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), pp. 902–913. doi: 10.61096/ijamscr.v6.iss4.2018.902-913.