PT - JOURNAL ARTICLE AU - Peter L. Bernstein TI - Diversification's critical variable AID - 10.3905/jpm.1986.409066 DP - 1986 Jul 31 TA - The Journal of Portfolio Management PG - 1--3 VI - 12 IP - 4 4099 - https://pm-research.com/content/12/4/1.short 4100 - https://pm-research.com/content/12/4/1.full