Tetikkurt, Cuneyt, Bahar Kubat, Seza Tetikkurt, and Gulsum Karakas. “An Atypical Acute Exacerbation of COPD Due to Aspergillus Fumigatus”. Monaldi Archives for Chest Disease 90, no. 1 (January 27, 2020). Accessed February 29, 2020. https://monaldi-archives.org/index.php/macd/article/view/1155.