ROTA, B. J. Variance estimation in two-step calibration for nonresponse adjustment. South African Statistical Journal, [S. l.], v. 51, n. 2, p. 361–374, 2017. DOI: 10.37920/sasj.2017.51.2.8. Disponível em: https://www.journals.ac.za/index.php/sasj/article/view/5218. Acesso em: 3 apr. 2026.