[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