TY  - JOUR
AU  - Daniel Lenz
AU  - Peter Stollmann
AU  - Ivan Veselić
TI  - The Allegretto-Piepenbrink theorem for strongly local Dirichlet forms
JO  - Documenta mathematica
PY  - 2009
SP  - 167
EP  - 189
VL  - 14
UR  - http://geodesic.mathdoc.fr/articles/10.4171/dm/269/
DO  - 10.4171/dm/269
ID  - 10_4171_dm_269
ER  -