HINTIKKA, K. J. An application of logic to algebra. MATHEMATICA SCANDINAVICA, [S. l.], v. 2, p. 242–245, 1954. DOI: 10.7146/math.scand.a-10411. Disponível em: https://www.mscand.dk/article/view/10411. Acesso em: 14 apr. 2025.