TY  - JOUR
AU  - I. T. Kiguradze
TI  - The periodic boundary value problem for a two-dimensional differential system
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 996
EP  - 1007
VL  - 13
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_6_a3/
LA  - ru
ID  - DE_1977_13_6_a3
ER  -