RT Journal Article SR Electronic T1 Data Mining Corrections JF The Journal of Portfolio Management FD Institutional Investor Journals SP 60 OP 69 DO 10.3905/jpm.1994.409494 VO 21 IS 1 A1 Harry M. Markowitz A1 Gan Lin Xu YR 1994 UL https://pm-research.com/content/21/1/60.abstract AB