[1] Novotný M.:
One some operators reducing generalized grammars. Information and Control 26, No.З, 1974, 225-235.
MR 0363019
[2] Novotný M.: Constructions of grammars for formal languages. Rukopis.
[3] Krutský F.:
Homomorphic correspondences of relational systems. AUPO, Fac. rer. nat., Vol 76, Math. XXII (1983), 37-46.
MR 0744698 |
Zbl 0589.20050