YEN, C.-T. RINGS WITH $(R,R,R)$ AND $((R,R,R),R)$ IN THE LEFT NUCLEUS. Tamkang Journal of Mathematics, [S. l.], v. 24, n. 2, p. 209–213, 1993. DOI: 10.5556/j.tkjm.24.1993.4491. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4491. Acesso em: 18 apr. 2024.