Improved Estimator for Population Variance using two Auxiliary Information. Iraqi Statisticians journal, [S. l.], v. 3, n. 1, p. 157–166, 2026. DOI: 10.62933/aaky7031. Disponível em: https://isj.edu.iq/index.php/isj/article/view/198. Acesso em: 12 apr. 2026.