Timuda, Caesar Ensang, Susanthy Djajalaksana, Jani Jane Rosihaningsih Sugiri, Arinto Yudi Ponco Wardoyo, and Heri Sutanto. “Analysis of Results of Volatile Organic Compound (VOC) Measurements Using Breathanalyzer on COVID-19 Confirmed Patients With Pneumonia and Without Pneumonia”. International journal of health sciences 6, no. S9 (October 19, 2022): 3899–3910. Accessed May 14, 2025. https://sciencescholar.us/journal/index.php/ijhs/article/view/13506.