TY  - JOUR
AU  - Erik Balslev
TI  - Discreteness of the Spectrum of a Second Order Elliptic Differential Operator in L2 (rn).
JO  - Mathematica Scandinavica
PY  - 1968
SP  - 42
EP  - 50
VL  - 22
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MS2_1968__22_166029/
ID  - MS2_1968__22_166029
ER  -