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) (Feb. 2017), 23–34. DOI:https://doi.org/10.15678/ZNUEK.2016.0956.0802.