HARTNEY, J. F. T. On the Radical Theory of Distributively Generated Near-Ring. MATHEMATICA SCANDINAVICA, [S. l.], v. 23, p. 214–220, 1968. DOI: 10.7146/math.scand.a-10913. Disponível em: https://www.mscand.dk/article/view/10913. Acesso em: 6 may. 2024.