@article{05575247, title = {Constant sign and nodal solutions for problems with the }, journal = {Boundary Value Problems [electronic only]}, volume = {2009}, year = {2009}, doi = {10.1155/2009/820237}, zbl = {1171.35353}, language = {en}, url = {http://dml.mathdoc.fr/item/05575247} }
Agarwal, Ravi P.; Filippakis, Michael E.; O'Regan, Donal; Papageorgiou, Nikolaos S. Constant sign and nodal solutions for problems with the . Boundary Value Problems [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/820237. http://gdmltest.u-ga.fr/item/05575247/