N. Madu, P., T. O. Olatayo, and P. I. Ogunyinka. “Improved Mixed Estimator Using Two Auxiliary Variables For Full Extreme Maximum And Minimum Values In Single Phase Sampling”. IRAQI JOURNAL OF STATISTICAL SCIENCES, vol. 21, no. 1, June 2025, pp. 190-1, https://rjps.uomosul.edu.iq/index.php/stats/article/view/20594.