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References:
[1] Friš I.: Grammars with Partial Ordering of the Rules. Information and Control 12 (1968), 412-425. MR 0243952 | Zbl 0172.30002
[2] Friš I.: Correction to the article Grammars with Partial Ordering of the Rules. Information and Control 14 (1969), 5. MR 0243952
[3] Ginsburg S., Spanier E. H.: Derivation Bounded Languages. J. of Comp. and System Sci. 4 (1968), 228-251. MR 0241201 | Zbl 0176.16703
[4] Král J.: A Modification of the Substitution Theorem and some Necessary and Sufficient Conditions for a Set to be Context Free. Math. Systems Theory 4 (1970), 2, 129-139. MR 0272566
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