LUMLEY, T. XLISP-Stat Tools for Building Generalised Estimating Equation Models. Journal of Statistical Software, [S. l.], v. 1, n. 3, 1996. DOI: 10.18637/jss.v001.i03. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v001i03. Acesso em: 9 aug. 2022.