RT Journal Article SR Electronic T1 Convexity and Empirical Option Costs of Mortgage Securities JF The Journal of Fixed Income FD Institutional Investor Journals SP 64 OP 87 DO 10.3905/jfi.1997.408189 VO 6 IS 4 A1 Douglas T. Breeden YR 1997 UL https://pm-research.com/content/6/4/64.abstract AB