ZEILEIS, Achim; FISHER, Jason C.; HORNIK, Kurt; IHAKA, Ross; MCWHITE, Claire D.; MURRELL, Paul; STAUFFER, Reto; WILKE, Claus 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: 9 apr. 2025.