ROZENBERG, Grzegorz; SALOMAA, Arto. The Mathematical Theory of L Systems. DAIMI Report Series, [S. l.], v. 3, n. 33, 1974. DOI: 10.7146/dpb.v3i33.6453. Disponível em: https://tidsskrift.dk/daimipb/article/view/6453. Acesso em: 5 feb. 2026.