PT - JOURNAL ARTICLE ED - Bernstein, Peter L. TI - Plus Ca Change? AID - 10.3905/jpm.7.3.4 DP - 1981 Apr 30 TA - The Journal of Portfolio Management PG - 4--4 VI - 7 IP - 3 4099 - https://pm-research.com/content/7/3/4.short 4100 - https://pm-research.com/content/7/3/4.full