MAIR, P.; GROENEN, P. J. F.; DE LEEUW, J. More on Multidimensional Scaling and Unfolding in R: smacof Version 2. Journal of Statistical Software, [S. l.], v. 102, n. 10, p. 1–47, 2022. DOI: 10.18637/jss.v102.i10. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v102i10. Acesso em: 26 may. 2022.