KOHLENBACH, Ulrich. Things that can and things that can’t be done in PRA. BRICS Report Series, [S. l.], v. 5, n. 18, 1998. DOI: 10.7146/brics.v5i18.19424. Disponível em: https://tidsskrift.dk/brics/article/view/19424. Acesso em: 5 dec. 2025.