RT Journal Article SR Electronic T1 When does the Present Become an Anachronism? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 1 DO 10.3905/jpm.12.1.1 VO 12 IS 1 A2 Peter L. Bernstein YR 1985 UL https://pm-research.com/content/12/1/1.abstract AB