BATES, Douglas; MÄCHLER, Martin; BOLKER, Ben; WALKER, Steve. Fitting Linear Mixed-Effects Models Using lme4. Journal of Statistical Software, [S. l.], v. 67, n. 1, p. 1–48, 2015. DOI: 10.18637/jss.v067.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v067i01. Acesso em: 1 apr. 2025.