Weyenberg, G., Huggins, P., Schardl, C., Howe, D., & Yoshida, R. (2014). kdetrees: Non-parametric estimation of phylogenetic tree distributions. Bioinformatics (Oxford, England), 30(16), 2280-7. https://doi.org/10.1093/bioinformatics/btu258 (Original work published 2014)