RT Journal Article SR Electronic T1 An Improved Finite Difference Approach to Fitting the Initial Term Structure JF The Journal of Fixed Income FD Institutional Investor Journals SP 62 OP 81 DO 10.3905/jfi.1998.408222 VO 7 IS 4 A1 Kenneth R. Vetzal YR 1998 UL https://pm-research.com/content/7/4/62.abstract AB