RT Journal Article SR Electronic T1 The Magellan Fund and market efficiency JF The Journal of Portfolio Management FD Institutional Investor Journals SP 85 OP 88 DO 10.3905/jpm.1990.409294 VO 17 IS 1 A1 Alan J. Marcus YR 1990 UL https://pm-research.com/content/17/1/85.abstract AB