Sadiq, Noman, et al. “Effect of Blowing Balloon Exercise on Modulating Perceived Stress, Pulmonary Function Tests, Ventricular Depolarization and Repolarization”. Journal of Fatima Jinnah Medical University, vol. 12, no. 2, Oct. 2018, https://jfjmu.com/index.php/ojs/article/view/14.