Cywiński, Marcin, and Agnieszka Wilczyńska-Strawa. “Estimating the Determinants of the Passenger Air Transport Recovery After the Crisis Caused by the Covid-19 Pandemic Based on Quantitative Methods”. Safety & Defense 9, no. 2 (December 30, 2023): 71-79. Accessed April 15, 2024. https://sd-magazine.eu/index.php/sd/article/view/206.