HORVÁTH, S.; KINBER, E.; SALOMAA, A.; YU, S. Decision problems resulting from grammatical inference. Annales Fennici Mathematici, [S. l.], v. 12, n. 2, p. 287–298, 1987. DOI: 10.5186/aasfm.1987.1213. Disponível em: https://afm.journal.fi/article/view/134604. Acesso em: 25 nov. 2024.