DANVY, O.; YANG, Z. An Operational Investigation of the CPS Hierarchy. BRICS Report Series, [S. l.], v. 5, n. 35, 1998. DOI: 10.7146/brics.v5i35.21957. Disponível em: https://tidsskrift.dk/brics/article/view/21957. Acesso em: 21 nov. 2024.