TY  - JOUR
AU  - G. N. Petrovskiǐ
TI  - The construction of coefficient tests for the $G$-orthogonal reducibility and $G$-spherical compatibility of systems of linear differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1978
SP  - 637
EP  - 645
VL  - 14
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1978_14_4_a6/
LA  - ru
ID  - DE_1978_14_4_a6
ER  -