BIERNACKA, M.; DANVY, O. A Concrete Framework for Environment Machines. BRICS Report Series, [S. l.], v. 12, n. 15, 2005. DOI: 10.7146/brics.v12i15.21881. Disponível em: https://tidsskrift.dk/brics/article/view/21881. Acesso em: 4 may. 2024.