PT - JOURNAL ARTICLE AU - Thomas E. Messmore TI - The duration of surplus AID - 10.3905/jpm.1990.409251 DP - 1990 Jan 31 TA - The Journal of Portfolio Management PG - 19--22 VI - 16 IP - 2 4099 - https://pm-research.com/content/16/2/19.short 4100 - https://pm-research.com/content/16/2/19.full