GNATEK, Z. Empty names in the theory of direct reference. David Braun’s conception and its weaknesses (in Polish). Diametros, [S. l.], n. 27, p. 130–149, 2011. DOI: 10.13153/diam.27.2011.430. Disponível em: https://diametros.uj.edu.pl/diametros/article/view/430. Acesso em: 13 aug. 2022.