@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/