@article{MAN_1959__137_160676,
     author = {P.W. H\"AMISCH},
     title = {Metrische {Kontraktionen.}},
     journal = {Mathematische Annalen},
     pages = {136--141},
     year = {1959},
     volume = {137},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__137_160676/}
}