@article{MOMA_1956__60_176992,
     author = {Josef Weier},
     title = {\"Uber {Klassifizierung} homotoper {Abbildungen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {157--167},
     publisher = {mathdoc},
     volume = {60},
     year = {1956},
     zbl = {0074.38604},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1956__60_176992/}
}