Bhagyashree Gokhale 2020. Added effect of therapist made low cost flutter device for airway clearance in acute exacerbation of COPD. International Journal of Allied Medical Sciences and Clinical Research. 5, 1 (Aug. 2020), 298–302. DOI:https://doi.org/10.61096/ijamscr.v5.iss1.2017.298-302.