WEBER, Zach. True, Untrue, Valid, Invalid, Provable, Unprovable. Logic and Logical Philosophy, [S. l.], v. 34, n. 4, p. 703–731, 2024. DOI: 10.12775/LLP.2024.008. Disponível em: https://apcz.umk.pl/LLP/article/view/42753. Acesso em: 1 feb. 2026.