RT Journal Article SR Electronic T1 Efficient Markets, Index Funds, Illusion, and Reality JF The Journal of Portfolio Management FD Institutional Investor Journals SP 5 OP 20 DO 10.3905/jpm.1977.408620 VO 4 IS 1 A1 J. Michael Murphy YR 1977 UL https://pm-research.com/content/4/1/5.abstract AB