Singla, A., S. Gupta, and W. F. Khan. “Spontaneous Alveolo-Pleural Fistula in a Case of COVID-19 Pneumonia-Challenges and Solutions: Case Report”. International Surgery Journal, vol. 9, no. 1, Dec. 2021, pp. 229-32, doi:10.18203/2349-2902.isj20215162.