KUMAR PRADHAN, Bijoy. On efficiency of cluster sampling on sampling on two occasions. Statistica, [S. l.], v. 64, n. 1, p. 183–191, 2004. DOI: 10.6092/issn.1973-2201/31. Disponível em: https://rivista-statistica.unibo.it/article/view/31. Acesso em: 21 nov. 2024.