GAJDA, Zbigniew. A characterization of functions with dense graph in the plane or half-plane. Annales Mathematicae Silesianae, [S. l.], v. 2, p. 37–46, 1986. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14319. Acesso em: 8 may. 2025.