Al Kindi, A. H., J. B., S. M. Al Mubaihsi, and N. A. Al Kemyani. “Persistent Pneumothorax: Alveolar Pleural Fistula Due to a Hole in a Bulla”. Sultan Qaboos University Medical Journal, vol. 19, no. 2, Sept. 2019, pp. e164-165, doi:10.18295/squmj.2019.19.02.015.