Weyenberg, G., Huggins, P. M., Schardl, C. L., Howe, D. K., & 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)