NIELSON, F.; NIELSON, H. R. Multi-Level Languages: a Descriptive Framework. DAIMI Report Series, [S. l.], v. 25, n. 510, 1996. DOI: 10.7146/dpb.v25i510.7039. Disponível em: https://tidsskrift.dk/daimipb/article/view/7039. Acesso em: 9 may. 2024.