ANGELELLI, I. . Three Logicians: Aristotle, Saccheri, Frege. Acta Philosophica, [S. l.], v. 7, n. 1, p. 115–120, 1998. DOI: 10.17421/1121_2179_1998_07_01_Angelelli. Disponível em: https://www.actaphilosophica.it/article/view/4208. Acesso em: 16 jul. 2024.