RAMA KUMARI, S. A. M. . Epis and Permutative Posemigroups. Mathematical Statistician and Engineering Applications, [S. l.], v. 71, n. 4, p. 13220–13235, 2022. Disponível em: https://www.philstat.org/index.php/MSEA/article/view/2725. Acesso em: 6 mar. 2026.