@article{05575249, title = {Multiple positive solutions of a nonlinear four-point singular boundary value problem with a }, journal = {Boundary Value Problems [electronic only]}, volume = {2009}, year = {2009}, doi = {10.1155/2009/103276}, zbl = {1167.39004}, language = {en}, url = {http://dml.mathdoc.fr/item/05575249} }
Hong, Shihuang. Multiple positive solutions of a nonlinear four-point singular boundary value problem with a . Boundary Value Problems [electronic only], Tome 2009 (2009) . doi : 10.1155/2009/103276. http://gdmltest.u-ga.fr/item/05575249/