Coombes, K. R., Brock, G., Abrams, Z. B., & Abruzzo, L. V. (2019). Polychrome: Creating and Assessing Qualitative Palettes with Many Colors.
Journal of Statistical Software, Code Snippets
,
90
(1), 1–23. https://doi.org/10.18637/jss.v090.c01