Sarwar, K. A., U. Naseer, A. Tabassum, and F. Naseer. “Assessment of Inhalational Technique of Metered Dose Inhalers (pMDIs) Among Its Users”. Pakistan Journal of Chest Medicine, vol. 26, no. 1, Mar. 2020, pp. 15-21, https://mail.pjcm.net/index.php/pjcm/article/view/643.