Ogbeide, E. M., and J. E. Osemwenkhae. “Density Estimation Using a Modified Multivariate Cluster Sampling Kernel Approach”. Benin Journal of Statistics 4, no. 1 (January 13, 2021): 8– 17. Accessed June 20, 2026. https://www.bjs-uniben.org/index.php/home/article/view/33.