TY  - JOUR
AU  - Mezník, Ivan
TI  - On some closure properties of generable languages
JO  - Commentationes Mathematicae Universitatis Carolinae
PY  - 1973
SP  - 541
EP  - 552
VL  - 14
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/CMUC_1973__14_3_a9/
LA  - en
ID  - CMUC_1973__14_3_a9
ER  -