MCLAUGHLIN, T. G. A Note on Contraproduction Domains. MATHEMATICA SCANDINAVICA, [S. l.], v. 11, p. 175–178, 1962. DOI: 10.7146/math.scand.a-10664. Disponível em: https://www.mscand.dk/article/view/10664. Acesso em: 6 may. 2024.