Aishwarya Nair, Krishnaprasad K M, Gopala Krishna Alaparthi, Shyam Krishnan, and Santhosh Rai. “The Effect of Diaphragmatic Stretch Technique on Diaphragmatic Excursion in Chronic Obstructive Pulmonary Disease”. International Journal of Research in Pharmaceutical Sciences, vol. 11, no. 3, July 2020, pp. 4518-23, https://ijrps.com/home/article/view/1127.