RT Journal Article SR Electronic T1 Asset performance and surplus control JF The Journal of Portfolio Management FD Institutional Investor Journals SP 28 OP 37 DO 10.3905/jpm.1992.409395 VO 18 IS 2 A1 Martin L. Leibowitz A1 Stanley Kogelman A1 Lawrence N. Bader YR 1992 UL https://pm-research.com/content/18/2/28.abstract AB