@article{CM_1953__11__83_0,
     author = {Baum, Walter},
     title = {Die {Nullwegegruppe} und ihre {Verallgemeinerungen}},
     journal = {Compositio Mathematica},
     pages = {83--118},
     publisher = {Kraus Reprint},
     volume = {11},
     year = {1953},
     mrnumber = {63041},
     zbl = {0053.12703},
     language = {de},
     url = {http://www.numdam.org/item/CM_1953__11__83_0/}
}