@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 = {www.numdam.org/item/CM_1938__5__299_0/} }
Freudenthal, Hans. Über die Klassen der Sphärenabbildungen I. Große Dimensionen. Compositio Mathematica, Tome 5 (1938) , pp. 299-314. http://www.numdam.org/item/CM_1938__5__299_0/