ABD ELSALAM, Nidal Mohamed Mustafa. Clustering Component of Design Effect. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 20, n. 2, p. 173–185, 2015. Disponível em: https://gssrr.org/JournalOfBasicAndApplied/article/view/3459. Acesso em: 5 apr. 2026.