@article{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},
     pages = {301--312},
     publisher = {mathdoc},
     volume = {112},
     number = {3},
     year = {2014},
     doi = {10.4064/ap112-3-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap112-3-7/}
}