RT Journal Article SR Electronic T1 Global factors JF The Journal of Portfolio Management FD Institutional Investor Journals SP 79 OP 88 DO 10.3905/jpm.1989.409232 VO 16 IS 1 A1 Richard C Grinold A1 Andrew Rudd A1 Dan Stefek YR 1989 UL https://pm-research.com/content/16/1/79.abstract AB