@article{05791547, title = {Sign-changing and extremal constant-sign solutions of nonlinear elliptic Neumann boundary value problems.}, journal = {Boundary Value Problems [electronic only]}, volume = {2010}, year = {2010}, doi = {10.1155/2010/139126}, zbl = {1207.35171}, language = {en}, url = {http://dml.mathdoc.fr/item/05791547} }
Winkert, Patrick. Sign-changing and extremal constant-sign solutions of nonlinear elliptic Neumann boundary value problems.. Boundary Value Problems [electronic only], Tome 2010 (2010) . doi : 10.1155/2010/139126. http://gdmltest.u-ga.fr/item/05791547/