TY  - JOUR
AU  - V. I. Levenshtein
TI  - Certain properties of code systems
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 1274
EP  - 1277
VL  - 140
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_140_6_a10/
LA  - ru
ID  - DAN_1961_140_6_a10
ER  -