ABUJABAL, H. A. S. A GENERALIZATION OF SOME COMMUTATIVITY THEOREMS FOR RINGS I. Tamkang Journal of Mathematics, [S. l.], v. 21, n. 3, p. 239–245, 1990. DOI: 10.5556/j.tkjm.21.1990.4669. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4669. Acesso em: 3 may. 2024.