TY  - JOUR
AU  - K. Yu. Gorbunov
TI  - There does not exist an enumerable family of context-free grammars that generates the class of single-valued languages
JO  - Matematičeskie zametki
PY  - 1991
SP  - 34
EP  - 40
VL  - 50
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1991_50_1_a3/
LA  - ru
ID  - MZM_1991_50_1_a3
ER  -