P. G. ROMEO; R. AKHILA. On the biordered set of rings. Malaya Journal of Matematik, India, v. 4, n. 03, p. 463–467, 2016. DOI: 10.26637/mjm403/016. Disponível em: https://www.malayajournal.org/index.php/mjm/article/view/558. Acesso em: 16 jul. 2024.