TY  - JOUR
AU  - A. Yu. Duplishcheva
TI  - About differential operators and matrices of the second order
JO  - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics
PY  - 2015
SP  - 31
EP  - 37
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ISU_2015_15_1_a4/
LA  - ru
ID  - ISU_2015_15_1_a4
ER  -