@article{GDZPPN002270730, title = {Zum Clifford-KIeinschen Raumproblem}, journal = {Mathematische Annalen}, volume = {95}, year = {1926}, pages = {313-339}, language = {de}, url = {http://dml.mathdoc.fr/item/GDZPPN002270730} }
Hopf, H. Zum Clifford-KIeinschen Raumproblem. Mathematische Annalen, Tome 95 (1926) pp. 313-339. http://gdmltest.u-ga.fr/item/GDZPPN002270730/