GEMAWATI, S.; BIN AHMAD, A. G. THE GRAPH OF DIAGRAM GROUPS FROM DIRECT PRODUCT OF THREE FREE SEMIGROUPS. Journal of the Indonesian Mathematical Society, [S. l.], v. 13, n. 2, p. 209–214, 2012. DOI: 10.22342/jims.13.2.68.209-214. Disponível em: https://jims-a.org/index.php/jimsa/article/view/68. Acesso em: 2 may. 2024.