POGONOWSKI, Jerzy. Zermelo i Skolemici. Investigationes Linguisticae, [S. l.], v. 14, p. 166–167, 2007. DOI: 10.14746/il.2006.14.14. Disponível em: https://pressto.amu.edu.pl/index.php/il/article/view/9102. Acesso em: 29 mar. 2024.