Hasan, M.A. et al. 2022. Comparison of Bronchodilator Response of Nebulized Salbutamol with Nebulized Salbutamol and Ipratropium Bromide in Patients with Acute Exacerbation of Advanced COPD. TAJ: Journal of Teachers Association. 34, 2 (Mar. 2022), 56–63. DOI:https://doi.org/10.3329/taj.v34i2.58556.