RT Journal Article SR Electronic T1 New evidence on timing and security selection skill of mutual funds JF The Journal of Portfolio Management FD Institutional Investor Journals SP 80 OP 83 DO 10.3905/jpm.1991.409324 VO 17 IS 2 A1 Cheng F. Lee A1 Shafiqur Rahman YR 1991 UL https://pm-research.com/content/17/2/80.abstract AB