LENTH, R. . V. . Response-Surface Methods in R, Using rsm. Journal of Statistical Software, [S. l.], v. 32, n. 7, p. 1–17, 2009. DOI: 10.18637/jss.v032.i07. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v032i07. Acesso em: 25 apr. 2024.