RAMAMURTHI, V. S.; RANGASWAMY, K. M. Generalized $V$-Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 31, p. 69–77, 1972. DOI: 10.7146/math.scand.a-11412. Disponível em: https://www.mscand.dk/article/view/11412. Acesso em: 14 apr. 2025.