Ndubisi Madu, P., T. O. Olatayo, P. I. Ogunyinka, E. A. Ayanlowo, and A. S. Odeyemi. “Improved Ratio-Cum Regression Estimator Using Two Auxiliary Variables In Single Phase Sampling”. IRAQI JOURNAL OF STATISTICAL SCIENCES, vol. 21, no. 2, Nov. 2024, pp. 80-91, doi:10.33899/iqjoss.2024.185243.