On Companion B-algebras. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 12, n. 3, p. 1248–1259, 2019. DOI: 10.29020/nybg.ejpam.v12i3.3495. Disponível em: https://www.ejpam.com/ejpam/article/view/3495. Acesso em: 23 feb. 2026.