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://journals.ku.edu.kw/kjs/index.php/KJS/article/view/1727. Acesso em: 6 may. 2026.