@article{05237114, title = {Positive solutions of boundary value problems for system of nonlinear fourth-order differential equations.}, journal = {Boundary Value Problems [electronic only]}, volume = {2007}, year = {2007}, doi = {10.1155/2007/76493}, zbl = {1139.34304}, language = {en}, url = {http://dml.mathdoc.fr/item/05237114} }
Xie, Shengli; Zhu, Jiang. Positive solutions of boundary value problems for system of nonlinear fourth-order differential equations.. Boundary Value Problems [electronic only], Tome 2007 (2007) . doi : 10.1155/2007/76493. http://gdmltest.u-ga.fr/item/05237114/