E. M. Ogbeide and J. E. Osemwenkhae, “Density Estimation using a Modified Multivariate Cluster Sampling Kernel Approach”, BJS, vol. 4, no. 1, pp. 8– 17, Jan. 2021, Accessed: Dec. 16, 2025. [Online]. Available: https://www.bjs-uniben.org/index.php/home/article/view/33