ISMAIL, M.; KAWNAL, N.; SHAHBAZ, M. Q. Generalized ratio-product-type estimator for variance using auxiliary information in simple random sampling. Kuwait Journal of Science, [S. l.], v. 45, n. 1, 2018. Disponível em: https://journalskuwait.org/kjs/index.php/KJS/article/view/1727. Acesso em: 25 apr. 2026.