TY  - JOUR
AU  - GUNNAR EHRLING
TI  - On a type of eigenvalue problems for certain elliptic differential operators
JO  - Mathematica Scandinavica
PY  - 1954
SP  - 267
EP  - 285
VL  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1954__2_165550/
ID  - MS2_1954__2_165550
ER  -