RT Journal Article SR Electronic T1 Beta as an Oxymoron JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 2 DO 10.3905/jpm.2015.41.2.001 VO 41 IS 2 A1 Mark Anson YR 2015 UL https://pm-research.com/content/41/2/1.abstract AB