Jurek, Łukasz. “The Situation on the Labor Market and Sickness Absence: A Cyclical and Seasonal Approach”. Studia Prawno-Ekonomiczne 120 (December 8, 2021): 197–219. Accessed April 17, 2024. https://czasopisma.ltn.lodz.pl/Studia-Prawno-Ekonomiczne/article/view/1513.