TY  - JOUR
AU  - Yu. A. Chirkunov
TI  - Group classification of systems of first-order linear differential
JO  - Doklady Akademii Nauk
PY  - 1990
SP  - 155
EP  - 159
VL  - 314
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1990_314_1_a37/
LA  - ru
ID  - DAN_1990_314_1_a37
ER  -