عبد العزيز احمد ر. On some Ratio and Regression Estimators for the Finite Population Variance in Two Phase Sampling. IQJOSS [Internet]. 2010 Dec. 1 [cited 2025 Sep. 6];10(2):117-32. Available from: https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29054