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References:
[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
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