JONES, N. D.; SKYUM, S. Lower Bounds on the Complexity of Some Problems: Concerning L Systems. DAIMI Report Series, [S. l.], v. 6, n. 70, 1977. DOI: 10.7146/dpb.v6i70.6488. Disponível em: https://tidsskrift.dk/daimipb/article/view/6488. Acesso em: 9 may. 2024.