RT Journal Article SR Electronic T1 Alpha-Beta Theory JF The Journal of Portfolio Management FD Institutional Investor Journals SP 35 OP 40 DO 10.3905/jpm.1977.408607 VO 3 IS 4 A1 George M. Frankfurter A1 Herbert E. Phillips YR 1977 UL https://pm-research.com/content/3/4/35.abstract AB