Wyszyński, Artur. “Impact of the Covid-19 Pandemic on the Situation and Financial Results of the Ekstraklasa Football Clubs”. Olsztyn Economic Journal 18, no. 1 (June 30, 2023): 63–75. Accessed July 22, 2024. https://czasopisma.uwm.edu.pl/index.php/oej/article/view/9735.