CONIGLIO, M. E.; VICENTIN DE TOLEDO, G. Weakly Free Multialgebras. Bulletin of the Section of Logic, [S. l.], v. 51, n. 1, p. 109–141, 2021. DOI: 10.18778/0138-0680.2021.19. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/5680. Acesso em: 14 aug. 2022.