OOSTEN, J. van. Fibrations and Calculi of Fractions. BRICS Report Series, [S. l.], v. 1, n. 37, 1994. DOI: 10.7146/brics.v1i37.21606. Disponível em: https://tidsskrift.dk/brics/article/view/21606. Acesso em: 1 may. 2024.