RT Journal Article SR Electronic T1 The uses of contingent immunization JF The Journal of Portfolio Management FD Institutional Investor Journals SP 51 OP 55 DO 10.3905/jpm.1981.408835 VO 8 IS 1 A1 Martin L. Leibowitz A1 Alfred Weinberger YR 1981 UL https://pm-research.com/content/8/1/51.abstract AB