TY  - JOUR
AU  - A. K. Demenchuk
TI  - Necessary and sufficient conditions for the existence of periodic solutions of linear nonhomogeneous Pfaffian systems
JO  - Differencialʹnye uravneniâ
PY  - 1997
SP  - 155
EP  - 157
VL  - 33
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1997_33_2_a1/
LA  - ru
ID  - DE_1997_33_2_a1
ER  -