AGARWAL, S. K.; AL MANNAI, M. Linear combination of estimators in probability proportional to sizes sampling to estimate the population. Statistica, [S. l.], v. 69, n. 1, p. 59–71, 2009. DOI: 10.6092/issn.1973-2201/3548. Disponível em: https://rivista-statistica.unibo.it/article/view/3548. Acesso em: 25 apr. 2024.