@article{GDZPPN00232167X,
title = {On Positive Solutions of a Linear Elliptic Eigenvalue Problem with Neumann Boundary Conditions.},
journal = {Mathematische Annalen},
volume = {255},
year = {1981},
pages = {459-470},
zbl = {0485.35042},
url = {http://dml.mathdoc.fr/item/GDZPPN00232167X}
}
Hess, Peter; Senn, Stefan. On Positive Solutions of a Linear Elliptic Eigenvalue Problem with Neumann Boundary Conditions.. Mathematische Annalen, Tome 255 (1981) pp. 459-470. http://gdmltest.u-ga.fr/item/GDZPPN00232167X/