PT - JOURNAL ARTICLE AU - Kirt C. Butler AU - Dale L. Domian TI - Risk, diversification, and the investment horizon AID - 10.3905/jpm.1991.409334 DP - 1991 Apr 30 TA - The Journal of Portfolio Management PG - 41--47 VI - 17 IP - 3 4099 - https://pm-research.com/content/17/3/41.short 4100 - https://pm-research.com/content/17/3/41.full