SPEITEL, S. G. W. Logical Constants and Arithmetical Forms. Logic and Logical Philosophy, [S. l.], v. 32, n. 3, p. 495–510, 2023. DOI: 10.12775/LLP.2023.012. Disponível em: https://apcz.umk.pl/LLP/article/view/43725. Acesso em: 18 jul. 2024.