ULKHAQ, M. M.; ADYATAMA, A. Clustering countries according to the world happiness report 2019. Engineering and Applied Science Research, [S. l.], v. 48, n. 2, p. 137–150, 2021. Disponível em: https://ph01.tci-thaijo.org/index.php/easr/article/view/240569. Acesso em: 4 may. 2024.