The Strong Semilattice of Pi-groups. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 11, n. 3, p. 589–597, 2018. DOI: 10.29020/nybg.ejpam.v11i3.3274. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/3274. Acesso em: 14 oct. 2024.