FERWERDA, J.; HAINMUELLER, J.; HAZLETT, C. J. Kernel-Based Regularized Least Squares in R (KRLS) and Stata (krls). Journal of Statistical Software, [S. l.], v. 79, n. 3, p. 1–26, 2017. DOI: 10.18637/jss.v079.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v079i03. Acesso em: 30 jun. 2024.