MAZZA, A.; PUNZO, A.; MCGUIRE, B. KernSmoothIRT: An R Package for Kernel Smoothing in Item Response Theory. Journal of Statistical Software, [S. l.], v. 58, n. 6, p. 1–34, 2014. DOI: 10.18637/jss.v058.i06. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v058i06. Acesso em: 18 aug. 2022.