VAN DER HEIJDEN, P. G. M.; VAN BUUREN, S. Looking Back at the Gifi System of Nonlinear Multivariate Analysis. Journal of Statistical Software, [S. l.], v. 73, n. 4, p. 1–8, 2016. DOI: 10.18637/jss.v073.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v073i04. Acesso em: 27 nov. 2022.