@article{02146803,
title = {Nodal domain theorems \`a la Courant.},
journal = {Documenta Mathematica},
volume = {9},
year = {2004},
pages = {283-299},
zbl = {1067.35051},
language = {en},
url = {http://dml.mathdoc.fr/item/02146803}
}
Ancona, A.; Helffer, B.; Hoffmann-Ostenhof, T. Nodal domain theorems à la Courant.. Documenta Mathematica, Tome 9 (2004) pp. 283-299. http://gdmltest.u-ga.fr/item/02146803/