WALENDZIAK, Andrzej. On Pre-Hilbert and Positive Implicative Pre-Hilbert Algebras. Bulletin of the Section of Logic, [S. l.], v. 53, n. 3, p. 345–364, 2024. DOI: 10.18778/0138-0680.2024.07. Disponível em: https://www.czasopisma.uni.lodz.pl/bulletin/article/view/19018. Acesso em: 6 dec. 2025.