PT - JOURNAL ARTICLE AU - Robert A Ferguson TI - Reply AID - 10.3905/jpm.1988.409138 DP - 1988 Jan 31 TA - The Journal of Portfolio Management PG - 77--78 VI - 14 IP - 2 4099 - https://pm-research.com/content/14/2/77.short 4100 - https://pm-research.com/content/14/2/77.full