GRAMACY, R. B.; TADDY, M. A. Categorical Inputs, Sensitivity Analysis, Optimization and Importance Tempering with tgp Version 2, an R Package for Treed Gaussian Process Models. Journal of Statistical Software, [S. l.], v. 33, n. 6, p. 1–48, 2010. DOI: 10.18637/jss.v033.i06. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v033i06. Acesso em: 3 dec. 2022.