WALENDZIAK, Andrzej. Exchange pre-Hilbert algebras and their connections with other algebras of logic. Italian Journal of Pure and Applied Mathematics, [S. l.], v. 53, p. 200–214, 2025. Disponível em: https://journals.uniurb.it/index.php/ijpam/article/view/5663. Acesso em: 18 may. 2026.