RT Journal Article SR Electronic T1 Beta Loss, Beta Quotient JF The Journal of Portfolio Management FD Institutional Investor Journals SP 75 OP 78 DO 10.3905/jpm.1985.409015 VO 11 IS 4 A1 Tony van Zijl YR 1985 UL https://pm-research.com/content/11/4/75.abstract AB