TY  - JOUR
AU  - P. A. Shvartsman
TI  - A contribution to the theory of standard systems of differential equations of positive type with periodic coefficients
JO  - Doklady Akademii Nauk
PY  - 1966
SP  - 1019
EP  - 1022
VL  - 168
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1966_168_5_a12/
LA  - ru
ID  - DAN_1966_168_5_a12
ER  -