PT - JOURNAL ARTICLE AU - Harold Bierman, Jr. TI - How Much Diversification is Desirable? AID - 10.3905/jpm.1980.42 DP - 1980 Oct 31 TA - The Journal of Portfolio Management PG - 42--44 VI - 7 IP - 1 4099 - https://pm-research.com/content/7/1/42.short 4100 - https://pm-research.com/content/7/1/42.full