PAOLI, F.; PRA BALDI, M. .; SZMUC, D. Pure Variable Inclusion Logics. Logic and Logical Philosophy, [S. l.], v. 30, n. 4, p. 631–652, 2021. DOI: 10.12775/LLP.2021.015. Disponível em: https://apcz.umk.pl/LLP/article/view/36176. Acesso em: 1 dec. 2022.