RT Journal Article SR Electronic T1 Constant proportion portfolio insurance for fixed-income investment JF The Journal of Portfolio Management FD Institutional Investor Journals SP 58 OP 66 DO 10.3905/jpm.1989.409214 VO 15 IS 4 A1 Erol Hakanoglu A1 Robert W Kopprasch A1 Emmanuel Roman YR 1989 UL https://pm-research.com/content/15/4/58.abstract AB