RT Journal Article SR Electronic T1 The use of “alphas” to improve performance JF The Journal of Portfolio Management FD Institutional Investor Journals SP 86 OP 92 DO 10.3905/jpm.1984.408977 VO 11 IS 1 A1 Marshall E. Blume YR 1984 UL https://pm-research.com/content/11/1/86.abstract AB