Nurfaizi, A., I. A. Marhana, G. M. Sari, and A. Bakhtiar. “Correlation Between FEV1% Predicted and Blood Eosinophils in Patients With Exacerbations of Chronic Obstructive Pulmonary Disease (COPD)”. Jurnal Respirasi, vol. 7, no. 2, May 2021, pp. 59-64, doi:10.20473/jr.v7-I.2.2021.59-64.