@article{urn:eudml:doc:38717, title = {Positive solutions of systems of boundary value problems.}, journal = {Extracta Mathematicae}, volume = {18}, year = {2003}, pages = {23-32}, zbl = {1046.34044}, mrnumber = {MR1989295}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:38717} }
Herzog, Gerd; Lemmert, Roland. Positive solutions of systems of boundary value problems.. Extracta Mathematicae, Tome 18 (2003) pp. 23-32. http://gdmltest.u-ga.fr/item/urn:eudml:doc:38717/