KUMAR, S. . VARIANCE ESTIMATION IN PRESENCE OF RANDOM NON-RESPONSE. Journal of Reliability and Statistical Studies, [S. l.], v. 7, n. 02, p. 65–70, 2014. Disponível em: https://journals.riverpublishers.com/index.php/JRSS/article/view/21141. Acesso em: 28 apr. 2026.