%0 Journal Article
%A Daniel Lenz
%A Peter Stollmann
%A Ivan Veselić
%T The Allegretto-Piepenbrink theorem for strongly local Dirichlet forms
%J Documenta mathematica
%D 2009
%P 167-189
%V 14
%U http://geodesic.mathdoc.fr/articles/10.4171/dm/269/
%R 10.4171/dm/269
%F 10_4171_dm_269