Lisicki B. Differentiation of Beta Coefficients during COVID-19 Pandemic – the Example of Stocks of the Largest Companies Listed on the Warsaw Stock Exchange. KREM [Internet]. 2023 Mar. 29 [cited 2024 Jul. 27];(4(998):11-28. Available from: https://zeszyty-naukowe.uek.krakow.pl/index.php/zeszyty-naukowe/article/view/2274