This paper investigates the existence of positive solutions for a fourth-order differential system using a fixed point theorem of cone expansion and compression type.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-ap112-3-7, author = {Ravi P. Agarwal and B. Kovacs and D. O'Regan}, title = {Existence of positive solutions for a fourth-order differential system}, journal = {Annales Polonici Mathematici}, volume = {111}, year = {2014}, pages = {301-312}, zbl = {1319.34037}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap112-3-7} }
Ravi P. Agarwal; B. Kovacs; D. O'Regan. Existence of positive solutions for a fourth-order differential system. Annales Polonici Mathematici, Tome 111 (2014) pp. 301-312. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-ap112-3-7/