@article{ELMA_1994__49_1_141567,
     author = {Heinz Hopf},
     title = {Einige {Anwendungen} der {Topologie} auf die {Algebra.}},
     journal = {Elemente der Mathematik},
     pages = {137--148},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1994},
     zbl = {0862.01017},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141567/}
}