Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1943__16_138827, author = {Heinz Hopf}, title = {Enden offener {R\"aume} und unendliche diskontinuierliche {Gruppen.}}, journal = {Commentarii mathematici Helvetici}, pages = {81--100}, publisher = {mathdoc}, volume = {16}, year = {1943}, zbl = {0060.40008}, url = {http://geodesic.mathdoc.fr/item/CMH_1943__16_138827/} }
Heinz Hopf. Enden offener Räume und unendliche diskontinuierliche Gruppen.. Commentarii mathematici Helvetici, Tome 16 (1943), pp. 81-100. http://geodesic.mathdoc.fr/item/CMH_1943__16_138827/