SAHOO, L. N.; MISHRA, G. Classes of transformed ratio and product estimators in two stage sampling. Statistica, [S. l.], v. 49, n. 2, p. 295–298, 1989. DOI: 10.6092/issn.1973-2201/798. Disponível em: https://rivista-statistica.unibo.it/article/view/798. Acesso em: 5 may. 2024.