@article{ELMA_1976__31_141176,
     author = {Ladnor Geissinger},
     title = {Bemerkungen zum {Kontraktionsprinzip.}},
     journal = {Elemente der Mathematik},
     pages = {90--91},
     year = {1976},
     volume = {31},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1976__31_141176/}
}