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 (December 1, 1995): 377–385. Accessed December 5, 2025. https://platform.openjournals.nl/PAC/article/view/24646.