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@article{CMH_1969__44_139396, author = {Simon Courant}, title = {Beitr\"age zur {Theorie} der limitierten {Vektorr\"aume.}}, journal = {Commentarii mathematici Helvetici}, pages = {249--268}, publisher = {mathdoc}, volume = {44}, year = {1969}, zbl = {0176.42403}, url = {http://geodesic.mathdoc.fr/item/CMH_1969__44_139396/} }
Simon Courant. Beiträge zur Theorie der limitierten Vektorräume.. Commentarii mathematici Helvetici, Tome 44 (1969), pp. 249-268. http://geodesic.mathdoc.fr/item/CMH_1969__44_139396/