HESS, L.; MAYOH, B. H. Graph Grammars for Knowledge Representation. DAIMI Report Series, [S. l.], v. 19, n. 304, 1990. DOI: 10.7146/dpb.v19i304.6697. Disponível em: https://tidsskrift.dk/daimipb/article/view/6697. Acesso em: 9 may. 2024.