TY  - JOUR
AU  - A. L. Semenov
TI  - Algorithmic problems for power series and context-free grammars
JO  - Doklady Akademii Nauk
PY  - 1973
SP  - 50
EP  - 52
VL  - 212
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1973_212_1_a11/
LA  - ru
ID  - DAN_1973_212_1_a11
ER  -