Kasolik, M. (2017). Testing the Effectiveness of CAPM in the Valuation of Financial Instruments − Estimation of the Risk-free Rate Using a Zero-beta Portfolio. Krakow Review of Economics and Management Zeszyty Naukowe Uniwersytetu Ekonomicznego W Krakowie, 8(956), 23-34. https://doi.org/10.15678/ZNUEK.2016.0956.0802