RT Journal Article SR Electronic T1 Instrumentality JF The Journal of Portfolio Management FD Institutional Investor Journals SP 9 OP 20 DO 10.3905/jpm.1995.409543 VO 22 IS 1 A1 Martin S. Fridson A1 Jón G. Jónsson YR 1995 UL https://pm-research.com/content/22/1/9.abstract AB