@article{CM_1938__5__299_0,
     author = {Freudenthal, Hans},
     title = {\"Uber die {Klassen} der {Sph\"arenabbildungen} {I.} {Gro{\ss}e} {Dimensionen}},
     journal = {Compositio Mathematica},
     pages = {299--314},
     publisher = {Johnson Reprint Corporation},
     volume = {5},
     year = {1938},
     zbl = {0018.17705},
     language = {de},
     url = {http://www.numdam.org/item/CM_1938__5__299_0/}
}