FJELLSTAD, Andreas. Tautology Elimination, Cut Elimination and S4?. Logic and Logical Philosophy, [S. l.], p. 1–9, 2025. DOI: 10.12775/LLP.2025.028. Disponível em: https://apcz.umk.pl/LLP/article/view/60563. Acesso em: 10 dec. 2025.