RT Journal Article SR Electronic T1 Light and Shadow in the International Scene JF The Journal of Portfolio Management FD Institutional Investor Journals SP 4 OP 4 DO 10.3905/jpm.1977.408601 VO 3 IS 3 A1 Peter L. Bernstein YR 1977 UL https://pm-research.com/content/3/3/4.abstract AB