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@article{JRAM_1960__203_150427, author = {G\"unter Ewald and LeRoy M. Kelly}, title = {Tangents in {Real} {Banach} {Spaces.}}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {160--173}, publisher = {mathdoc}, volume = {203}, year = {1960}, zbl = {0094.35105}, url = {http://geodesic.mathdoc.fr/item/JRAM_1960__203_150427/} }
Günter Ewald; LeRoy M. Kelly. Tangents in Real Banach Spaces.. Journal für die reine und angewandte Mathematik, Tome 203 (1960), pp. 160-173. http://geodesic.mathdoc.fr/item/JRAM_1960__203_150427/