TY  - JOUR
AU  - L. P. Zhil'tsova
TI  - Algorithmic complexity of problems of optimal alphabetical coding for context-free languages
JO  - Diskretnaya Matematika
PY  - 1989
SP  - 38
EP  - 51
VL  - 1
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DM_1989_1_2_a3/
LA  - ru
ID  - DM_1989_1_2_a3
ER  -