K. E. SATHAPPAN; R. SUMATHI. L-Fuzzy Bi-ideal of a Ring. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 3, p. 237–242, 2018. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/376. Acesso em: 5 may. 2024.