RT Journal Article SR Electronic T1 INVITED EDITORIAL COMMENT JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 3 DO 10.3905/jpm.2013.39.4.001 VO 39 IS 4 A1 Harry M. Markowitz YR 2013 UL https://pm-research.com/content/39/4/1.abstract AB