@article{RCM_2004_38_2_a0,
     author = {Jaime Rodriguez-Montes Universidad Nacional de Colombia},
     title = {Fixed points of the contractive or expansive type for multivalued mappings: toward a unified approach},
     journal = {Revista colombiana de matematicas},
     pages = {35--52},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {2004},
     url = {http://geodesic.mathdoc.fr/item/RCM_2004_38_2_a0/}
}