TY  - JOUR
AU  - A. O. Bagapsh
TI  - Perturbation method for strongly elliptic second order systems with constant coefficients
JO  - Ufa mathematical journal
PY  - 2023
SP  - 21
EP  - 30
VL  - 15
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/UFA_2023_15_4_a1/
LA  - en
ID  - UFA_2023_15_4_a1
ER  -