Ndubisi Madu, Peter, Timothy O. Olatayo, Peter I. Ogunyinka, Emmanuel A. Ayanlowo, and Akinwumi, S. Odeyemi. “Improved Ratio-Cum Regression Estimator Using Two Auxiliary Variables In Single Phase Sampling”. IRAQI JOURNAL OF STATISTICAL SCIENCES 21, no. 2 (November 1, 2024): 80–91. Accessed September 4, 2025. https://ojs.uomosul.edu.iq/index.php/stats/article/view/29454.