SAHOO, L.; NAYAK, S. A Generalized πps Sampling Scheme of Two Units. Thailand Statistician, [S. l.], v. 9, n. 2, p. 143–150, 2015. Disponível em: https://ph02.tci-thaijo.org/index.php/thaistat/article/view/34238. Acesso em: 3 may. 2024.