VANDERVEKEN, D.; NOWAK, M. An Algebraic Approach to a Concept of Proposition. Acta Universitatis Lodziensis. Folia Philosophica. Ethica-Aesthetica-Practica, [S. l.], n. 9, p. 115–123, 1993. DOI: 10.18778/0208-6107.09.12. Disponível em: https://czasopisma.uni.lodz.pl/philosophica/article/view/17757. Acesso em: 20 maj. 2024.