RT Journal Article SR Electronic T1 Volatility and predictability of manager alpha JF The Journal of Portfolio Management FD Institutional Investor Journals SP 5 OP 12 DO 10.3905/jpm.1991.409388 VO 18 IS 1 A1 Jon A. Christopherson A1 Andrew L. Turner YR 1991 UL https://pm-research.com/content/18/1/5.abstract AB