JUHÁSZ, Istvan; WEISS, William A. R. Nowhere dense choices and π-weight. Annales Mathematicae Silesianae, [S. l.], v. 2, p. 85–91, 1986. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14327. Acesso em: 8 may. 2025.