TY  - JOUR
AU  - Sokolov,  Maksim S.
TI  - An abstract approach to some spectral problems of direct sum differential operators
JO  - Electronic journal of differential equations
PY  - 2003
VL  - 2003
UR  - http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a116/
LA  - en
ID  - EJDE_2003__2003__a116
ER  -