O'REGAN, William. Covering sponges with tubes. Annales Fennici Mathematici, [S. l.], v. 50, n. 2, p. 423–435, 2025. DOI: 10.54330/afm.163515. Disponível em: https://afm.journal.fi/article/view/163515. Acesso em: 7 mar. 2026.