SIVARAMAN, Dr. R. Equivalence Relations and Bell Numbers. International Journal of Psychosocial Rehabilitation, [S. l.], v. 24, n. 4, p. 10639–10647, 2020. DOI: 10.61841/0hn45477. Disponível em: https://psychosocial.com/index.php/ijpr/article/view/6292. Acesso em: 13 jul. 2025.