%0 Journal Article %A Arthur A. Eubank, Jr %A J. Kenton Zumwalt %T How to determine the stability of beta values %D 1979 %R 10.3905/jpm.1979.408678 %J The Journal of Portfolio Management %P 22-26 %V 5 %N 2 %U https://jpm.pm-research.com/content/iijpormgmt/5/2/22.full.pdf