RIIS, S. Count(q) versus the Pigeon-Hole Principle. BRICS Report Series, [S. l.], v. 1, n. 26, 1994. DOI: 10.7146/brics.v1i26.21640. Disponível em: https://tidsskrift.dk/brics/article/view/21640. Acesso em: 2 may. 2024.