TY  - JOUR
AU  - Christian G. Simader
TI  - An Elementary Proof of Harnack's Inequality for Schrödinger Operators and Related Topics.
JO  - Mathematische Zeitschrift
PY  - 1990
SP  - 129
EP  - 152
VL  - 203
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1990__203_3_174118/
ID  - MZ_1990__203_3_174118
ER  -