BIERNACKA, M.; DANVY, O. A Concrete Framework for Environment Machines. BRICS Report Series, [S. l.], v. 13, n. 3, 2006. DOI: 10.7146/brics.v13i3.21909. Disponível em: https://tidsskrift.dk/brics/article/view/21909. Acesso em: 25 apr. 2024.