RT Journal Article SR Electronic T1 A test of efficiency JF The Journal of Portfolio Management FD Institutional Investor Journals SP 44 OP 47 DO 10.3905/jpm.1981.408825 VO 8 IS 1 A1 Arlene Erlich Bearman A1 Betsey Epstein Kuhn YR 1981 UL https://pm-research.com/content/8/1/44.abstract AB