RT Journal Article SR Electronic T1 Measuring the Measurers JF The Journal of Portfolio Management FD Institutional Investor Journals SP 20 OP 22 DO 10.3905/jpm.1975.408539 VO 1 IS 4 A1 Sheen T. Kassouf YR 1975 UL https://pm-research.com/content/1/4/20.abstract AB