RESTALL, Greg. Structural Rules in Natural Deduction with Alternatives. Bulletin of the Section of Logic, [S. l.], v. 52, n. 2, p. 109–143, 2023. DOI: 10.18778/0138-0680.2023.6. Disponível em: https://www.czasopisma.uni.lodz.pl/bulletin/article/view/14404. Acesso em: 11 dec. 2025.