TY  - JOUR
AU  - A. A. Ilyin
TI  - Lower bounds for sums of eigenvalues of elliptic operators and systems
JO  - Sbornik. Mathematics
PY  - 2013
SP  - 563
EP  - 587
VL  - 204
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_2013_204_4_a4/
LA  - en
ID  - SM_2013_204_4_a4
ER  -