CHOLEWA, Piotr W. Duality principle of W. Sierpiński in the abstract Baire-cathegory theory. Annales Mathematicae Silesianae, [S. l.], v. 2, p. 30–36, 1986. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14315. Acesso em: 8 may. 2025.