RT Journal Article SR Electronic T1 The duration of surplus JF The Journal of Portfolio Management FD Institutional Investor Journals SP 19 OP 22 DO 10.3905/jpm.1990.409251 VO 16 IS 2 A1 Messmore, Thomas E. YR 1990 UL http://jpm.pm-research.com/content/16/2/19.abstract AB