Kasolik M. Testing the Effectiveness of CAPM in the Valuation of Financial Instruments − Estimation of the Risk-free Rate Using a Zero-beta Portfolio. KREM [Internet]. 2017 Feb. 14 [cited 2024 Nov. 23];(8(956):23-34. Available from: https://krem.uek.krakow.pl/index.php/krem/article/view/875