RT Journal Article SR Electronic T1 An “Essential Reservation” about the EMH JF The Journal of Portfolio Management FD Institutional Investor Journals SP 29 OP 30 DO 10.3905/jpm.1983.408926 VO 9 IS 4 A1 Roy A. Sorensen YR 1983 UL https://pm-research.com/content/9/4/29.abstract AB