Behera, A., M. K. H., R. Bakshi, and A. Sharma. “Ginkgo Leaf Sign on X-Ray Chest Due to Subcutaneous Emphysema in a COVID-19 Patient”. International Journal of Advances in Medicine, vol. 8, no. 8, July 2021, pp. 1223-5, doi:10.18203/2349-3933.ijam20212872.