RT Journal Article SR Electronic T1 How to determine the stability of beta values JF The Journal of Portfolio Management FD Institutional Investor Journals SP 22 OP 26 DO 10.3905/jpm.1979.408678 VO 5 IS 2 A1 Arthur A. Eubank, Jr A1 J. Kenton Zumwalt YR 1979 UL https://pm-research.com/content/5/2/22.abstract AB