عبد العزيز احمد ر. On some Ratio and Regression Estimators for the Finite Population Variance in Two Phase Sampling. IRAQI JOURNAL OF STATISTICAL SCIENCES, [S. l.], v. 10, n. 2, p. 117–132, 2010. DOI: 10.33899/iqjoss.2010.028419. Disponível em: https://tanmiyat.uomosul.edu.iq/index.php/stats/article/view/29054. Acesso em: 6 sep. 2025.