MORLEY, M.; VAUGHT, R. Homogeneous Universal Models. MATHEMATICA SCANDINAVICA, [S. l.], v. 11, p. 37–57, 1962. DOI: 10.7146/math.scand.a-10648. Disponível em: https://www.mscand.dk/article/view/10648. Acesso em: 7 may. 2024.