“Associations Between Measurement RV, RV TLC, and FRC TLC With Clinical Symptoms in COPD Patients in Persahabatan Hospital”. Jurnal Respirologi Indonesia 43, no. 4 (October 31, 2023): 239–246. Accessed April 3, 2026. https://jurnalrespirologi.org/index.php/jri/article/view/571.