FERSTL, R.; HAYDEN, J. Zero-Coupon Yield Curve Estimation with the Package termstrc. Journal of Statistical Software, [S. l.], v. 36, n. 1, p. 1–34, 2010. DOI: 10.18637/jss.v036.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v036i01. Acesso em: 17 aug. 2022.