@article{RCM_2012_46_2_a6,
     author = {German Lozada-Cruz},
     title = {A {Simple} {Observation} {Concerning} {Contraction} {Mappings}},
     journal = {Revista colombiana de matematicas},
     pages = {229--233},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2012},
     url = {http://geodesic.mathdoc.fr/item/RCM_2012_46_2_a6/}
}