van der Walt, Christiaan, and Etienne Barnard. “Variable Kernel Density Estimation in High-Dimensional Feature Spaces”. Proceedings of the AAAI Conference on Artificial Intelligence 31, no. 1 (February 13, 2017). Accessed July 26, 2026. https://ojs.aaai.org/index.php/AAAI/article/view/10885.