SKYUM, S. Decomposition Theorems for Various Kinds of Languages, Parallel in Nature. DAIMI Report Series, [S. l.], v. 3, n. 38, 1974. DOI: 10.7146/dpb.v3i38.6459. Disponível em: https://tidsskrift.dk/daimipb/article/view/6459. Acesso em: 9 may. 2024.