Novelli, Luca, et al. “Corticosteroid and Cyclophosphamide in Acute Exacerbation of Idiopathic Pulmonary Fibrosis: A Single Center Experience and Literature Review”.
Sarcoidosis, Vasculitis and Diffuse Lung Diseases, vol. 33, no. 4, Dec. 2016, pp. 385-91,
https://mattioli1885journals.com/index.php/sarcoidosis/article/view/4897.