TY  - JOUR
AU  - Kryzhevich, Sergey G.
AU  - Volpert, Vitaly A.
TI  - Different types of solvability conditions for differential operators
JO  - Electronic Journal of Differential Equations
PY  - 2006
VL  - 2006
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/EJDE_2006__2006__a116/
LA  - en
ID  - EJDE_2006__2006__a116
ER  -