BERGSTRA, J. A. Structural Equivalence of Arithmetical Expressions as a Technical Basis for Philosophical Arithmetic. Transmathematica, [S. l.], 2024. DOI: 10.36285/tm.99. Disponível em: https://transmathematica.org/index.php/journal/article/view/99. Acesso em: 2 may. 2026.