KOHLENBACH, U. A Note on Spector’s Quantifier-Free Rule of Extensionality. BRICS Report Series, [S. l.], v. 6, n. 20, 1999. DOI: 10.7146/brics.v6i20.20077. Disponível em: https://tidsskrift.dk/brics/article/view/20077. Acesso em: 26 apr. 2024.