TY  - JOUR
AU  - V. V. Velichenko
TI  - Problems of the invariance of discrete systems
JO  - Doklady Akademii Nauk
PY  - 1971
SP  - 284
EP  - 287
VL  - 201
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1971_201_2_a6/
LA  - ru
ID  - DAN_1971_201_2_a6
ER  -