@article{EJDE_2008__2008__a22,
     author = {Avery,  Richard and Henderson,  Johnny and O'Regan,  Donal},
     title = {Functional compression-expansion fixed point theorem},
     journal = {Electronic journal of differential equations},
     year = {2008},
     volume = {2008},
     zbl = {1149.47042},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2008__2008__a22/}
}