Khidir, Muhammad, Siswanto Siswanto, Henda Ageng Rasena, Roihan Mohamad Iqbal, Rahmaningsih Mara Sabirin, Rakhmat Ari Wibowo, and Sani Hadiyan Rasyid. “Comparison of Forced Expiratory Flow (FEF) 25-75% Between Post-COVID-19 Patients With Different Severity at Universitas Gadjah Mada Academic Hospital”. Jurnal Respirasi 10, no. 1 (January 30, 2024): 23–29. Accessed August 11, 2024. https://e-journal.unair.ac.id/JR/article/view/48758.