M. S. Khaled, F. Akter, K. Rahman, M. S. Ullah, and M. H. Rahman, “Bronchodilator Response to Salbutamol Delivered by Metered Dose Inhaler with Spacer and Dry Powder Inhaler in Acute Asthma In Children: A Comparative Study”, Bangladesh J Child Health, vol. 38, no. 2, pp. 68–73, Dec. 2014.