TY  - JOUR
AU  - V. F. Lisyanoi
TI  - Classification of formal periodic systems
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 2173
EP  - 2175
VL  - 21
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_12_a22/
LA  - ru
ID  - DE_1985_21_12_a22
ER  -