DE BOECK, Paul; BAKKER, Marjan; ZWITSER, Robert; NIVARD, Michel; HOFMAN, Abe; TUERLINCKX, Francis; PARTCHEV, Ivailo. The Estimation of Item Response Models with the lmer Function from the lme4 Package in R. Journal of Statistical Software, [S. l.], v. 39, n. 12, p. 1–28, 2011. DOI: 10.18637/jss.v039.i12. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v039i12. Acesso em: 2 apr. 2025.