%0 Journal Article
%A Bernard Helffer
%A Pierre H. Bérard
%T On Courant's Nodal Domain Property for Linear Combinations of Eigenfunctions. I
%J Documenta mathematica
%D 2018
%P 1561-1585
%V 23
%U http://geodesic.mathdoc.fr/articles/10.4171/dm/652/
%R 10.4171/dm/652
%F 10_4171_dm_652