WALENDZIAK, Andrzej. On pre-Hilbert and positive implicative pre-Hilbert algebras. Bulletin of the Section of Logic, [S. l.], p. 21 pp., 2024. DOI: 10.18778/0138-0680.2024.07. Disponível em: https://czasopisma.uni.lodz.pl/bulletin/article/view/19018. Acesso em: 22 jul. 2024.