RT Journal Article SR Electronic T1 dead-or Alive and Well? JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 4 DO 10.3905/jpm.1981.4 VO 7 IS 2 A2 Peter L. Bernstein YR 1981 UL https://pm-research.com/content/7/2/4.abstract AB