RT Journal Article SR Electronic T1 The Great Beta Deβate JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 1 DO 10.3905/jpm.19.1.1 VO 19 IS 1 A2 Peter L. Bernstein YR 1992 UL https://pm-research.com/content/19/1/1.abstract AB