M. N. Ashraf, M. A. Khan, M. Imran, I. Fazal, Z. Hassan, and L. Alam, “Comparison of Efficacy of Nebulized Salbutamol with Salbutamol / Ipratropium Combination in Acute Exacerbation of Chronic Obstructive Pulmonary Disease”, PAFMJ, vol. 73, no. SUPPL-1, pp. S36–39, Jul. 2023.