@article{05367990, title = {Multiple nodal solutions for some fourth-order boundary value problems via admissible invariant sets.}, journal = {Boundary Value Problems [electronic only]}, volume = {2008}, year = {2008}, doi = {10.1155/2008/403761}, zbl = {1158.34312}, language = {en}, url = {http://dml.mathdoc.fr/item/05367990} }
Yang, Yang; Zhang, Jihui; Zhang, Zhitao. Multiple nodal solutions for some fourth-order boundary value problems via admissible invariant sets.. Boundary Value Problems [electronic only], Tome 2008 (2008) . doi : 10.1155/2008/403761. http://gdmltest.u-ga.fr/item/05367990/