RT Journal Article SR Electronic T1 Peter L. Bernstein Special Commemorative Section JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 33 DO 10.3905/JPM.2009.35.4.004 VO 35 IS 4 A1 Peter L Bernstein YR 2009 UL https://pm-research.com/content/35/4/1.2.abstract AB