الدين ضياء الدين سعيد س. New Ratio Estimators in Simple Random Sampling Using (K) Factor. IRAQI JOURNAL OF STATISTICAL SCIENCES, [S. l.], v. 10, n. 1, p. 195–206, 2010. DOI: 10.33899/iqjoss.2010.029102. Disponível em: https://ojs.uomosul.edu.iq/index.php/stats/article/view/29120. Acesso em: 5 sep. 2025.