The fundamental problem of philosophy. Revista Universidad de Guayaquil, [S. l.], v. 91, n. 3, p. 205–206, 1994. DOI: 10.53591/rug.v91i3.1031. Disponível em: https://revistas.ug.edu.ec/index.php/rug/article/view/634. Acesso em: 5 dec. 2025.