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), pp. 23–34. doi:10.15678/ZNUEK.2016.0956.0802.