Khaled, M. S., 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 Journal of Child Health, vol. 38, no. 2, Dec. 2014, pp. 68-73, doi:10.3329/bjch.v38i2.21138.