KLEIN, A. A.; BELL, H. E. Some Noteworthy Properties of Zero Divisors in Infinite Rings. MATHEMATICA SCANDINAVICA, [S. l.], v. 75, p. 59–66, 1994. DOI: 10.7146/math.scand.a-12502. Disponível em: https://www.mscand.dk/article/view/12502. Acesso em: 30 apr. 2024.