RT Journal Article SR Electronic T1 Mortgage Portfolio Prepayment Rates JF The Journal of Fixed Income FD Institutional Investor Journals SP 21 OP 28 DO 10.3905/jfi.1992.408050 VO 2 IS 2 A1 Robert B. Perry YR 1992 UL https://pm-research.com/content/2/2/21.abstract AB