@article{05825775, title = {An overview of the lower and upper solutions method with nonlinear boundary value conditions.}, journal = {Boundary Value Problems [electronic only]}, volume = {2011}, year = {2011}, doi = {10.1155/2011/893753}, zbl = {1230.34001}, language = {en}, url = {http://dml.mathdoc.fr/item/05825775} }
Cabada, Alberto. An overview of the lower and upper solutions method with nonlinear boundary value conditions.. Boundary Value Problems [electronic only], Tome 2011 (2011) . doi : 10.1155/2011/893753. http://gdmltest.u-ga.fr/item/05825775/