RT Journal Article SR Electronic T1 Relative Strength does Persist! JF The Journal of Portfolio Management FD Institutional Investor Journals SP 38 OP 45 DO 10.3905/jpm.1977.408622 VO 4 IS 1 A1 Charles A. Akemann A1 Werner E. Keller YR 1977 UL https://pm-research.com/content/4/1/38.abstract AB