NGO, L.; WAND, M. P. Smoothing with Mixed Model Software. Journal of Statistical Software, [S. l.], v. 9, n. 1, p. 1–54, 2004. DOI: 10.18637/jss.v009.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v009i01. Acesso em: 30 jun. 2024.