TY  - JOUR
AU  - V. M. Filippov
TI  - A general approach to symmetrization of differential operators
JO  - Differencialʹnye uravneniâ
PY  - 1985
SP  - 539
EP  - 541
VL  - 21
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1985_21_3_a28/
LA  - ru
ID  - DE_1985_21_3_a28
ER  -