F. N. Anggreini, P. U. Dewi, F. P. Sitanggang, and D. G. M. Suadiatmika, “A Case Report: Serial Case of Spontaneous Pneumomediastinum and Subcutaneous Emphysema in COVID-19 Patients”, IJGHR, vol. 7, no. 2, pp. 793-804, Apr. 2025.