HESS, L.; MAYOH, B. H. Graphics and Their Grammars. DAIMI Report Series, [S. l.], v. 16, n. 223, 1987. DOI: 10.7146/dpb.v16i223.7573. Disponível em: https://tidsskrift.dk/daimipb/article/view/7573. Acesso em: 9 may. 2024.