@article{MZ_1954__61_169464,
     author = {Dieter Puppe},
     title = {Zur {Homotopie} von {Abbildungen} eines {Polyeders.}},
     journal = {Mathematische Zeitschrift},
     pages = {303--323},
     year = {1954},
     volume = {61},
     zbl = {0056.42002},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__61_169464/}
}