RT Journal Article SR Electronic T1 Optimal Portfolios from Simple Ranking Devices JF The Journal of Portfolio Management FD Institutional Investor Journals SP 15 OP 19 DO 10.3905/jpm.1978.408641 VO 4 IS 3 A1 Edwin J. Elton A1 Martin J. Gruber A1 Manfred W. Padberg YR 1978 UL https://pm-research.com/content/4/3/15.abstract AB