HURKMANS, Antoon. How Frege failed to prove the equivalence of ’nothing is F’ and ’the number of F’s = 0’ in Grundlagen. Proceedings of the Amsterdam Colloquium, Amsterdam, p. 377–385, 1995. Disponível em: https://platform.openjournals.nl/PAC/article/view/24646.. Acesso em: 31 jan. 2026.