PT - JOURNAL ARTICLE AU - George M Frankfurter AU - Allan Young TI - Reply AID - 10.3905/jpm.1981.408791 DP - 1981 Jan 31 TA - The Journal of Portfolio Management PG - 91--92 VI - 7 IP - 2 4099 - https://pm-research.com/content/7/2/91.short 4100 - https://pm-research.com/content/7/2/91.full