FRAGOS, Kostas. A 2-means Clustering Technique for Unsupervised Spam Filtering. International Journal of Sciences: Basic and Applied Research (IJSBAR), Jordan, v. 38, n. 1, p. 114–124, 2018. Disponível em: https://www.gssrr.org/JournalOfBasicAndApplied/article/view/8880. Acesso em: 6 dec. 2025.