RT Journal Article SR Electronic T1 Information Analysis JF The Journal of Portfolio Management FD Institutional Investor Journals SP 14 OP 21 DO 10.3905/jpm.1992.409408 VO 18 IS 3 A1 Richard C. Grinold A1 Ronald N. Kahn YR 1992 UL https://pm-research.com/content/18/3/14.abstract AB