MANULLANG, J.; SIRAIT, P.; ANDRI, A. Aplication of Validity Index in K Means and Fuzzy C Means. Jurnal Mantik, [S. l.], v. 4, n. 2, p. 1430-1438, 2020. DOI: 10.35335/mantik.Vol4.2020.958.pp1430-1438. Disponível em: https://iocscience.org/ejournal/index.php/mantik/article/view/958. Acesso em: 21 apr. 2026.