RT Journal Article SR Electronic T1 Using outside research JF The Journal of Portfolio Management FD Institutional Investor Journals SP 43 OP 45 DO 10.3905/jpm.9.3.43 VO 9 IS 3 A1 Unger, Raymond F. YR 1983 UL http://jpm.pm-research.com/content/9/3/43.abstract AB