FENSTAD, Jens Erik. On the Consistency of the Axiom of Comprehension in the Lukasiewicz Infinite Valued Logic. Mathematica Scandinavica, Berkeley, CA, United States, v. 14, p. 65–74, 1964. DOI: 10.7146/math.scand.a-10706. Disponível em: https://journals.msp.org/mscand/article/view/2600. Acesso em: 25 jul. 2026.