We consider a Lidstone boundary value problem in at resonance. We prove the existence of a solution under the assumption that the nonlinear part is a Carathéodory map and conditions similar to those of Landesman-Lazer are satisfied.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap95-1-1, author = {Mariusz Jurkiewicz}, title = {On solutions of a fourth-order Lidstone boundary value problem at resonance}, journal = {Annales Polonici Mathematici}, volume = {95}, year = {2009}, pages = {1-16}, zbl = {1163.34010}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap95-1-1} }
Mariusz Jurkiewicz. On solutions of a fourth-order Lidstone boundary value problem at resonance. Annales Polonici Mathematici, Tome 95 (2009) pp. 1-16. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap95-1-1/