RT Journal Article SR Electronic T1 Time-Varying Empirical Duration and Slope Effects for Mortgage-Backed Securities JF The Journal of Fixed Income FD Institutional Investor Journals SP 7 OP 28 DO 10.3905/jfi.1998.408242 VO 8 IS 2 A1 Stanley J. Kon A1 Christine Y. Polek YR 1998 UL https://pm-research.com/content/8/2/7.abstract AB