ZEILEIS, A.; FISHER, J. C.; HORNIK, K.; IHAKA, R.; MCWHITE, C. D.; MURRELL, P.; STAUFFER, R.; WILKE, C. O. colorspace: A Toolbox for Manipulating and Assessing Colors and Palettes. Journal of Statistical Software, [S. l.], v. 96, n. 1, p. 1–49, 2020. DOI: 10.18637/jss.v096.i01. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v096i01. Acesso em: 25 apr. 2024.