Borucka, Anna, Rafał Parczewski, Edward Kozłowski, and Andrzej Świderski. “Evaluation of Air Traffic in the Context of the Covid-19 Pandemic”. Archives of Transport 64, no. 4 (December 31, 2022): 45–57. Accessed July 22, 2024. https://archivesoftransport.com/index.php/aot/article/view/302.