RT Journal Article SR Electronic T1 MPT plus security analysis for better performance JF The Journal of Portfolio Management FD Institutional Investor Journals SP 29 OP 36 DO 10.3905/jpm.1982.408888 VO 8 IS 4 A1 George M. Frankfurter A1 Herbert E. Phillips YR 1982 UL https://pm-research.com/content/8/4/29.abstract AB