FJELLSTAD, Andreas. Tautology Elimination, Cut Elimination and S4?. Logic and Logical Philosophy, [S. l.], v. 35, n. 3, p. 499–507, 2025. DOI: 10.12775/LLP.2025.028. Disponível em: https://apcz.umk.pl/LLP/article/view/60563. Acesso em: 18 sep. 2026.