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@article{PORMA_1967__26_1_114994, author = {Bumcrot, Robert J.}, title = {Geometrical concepts in normed linear spaces}, journal = {Portugaliae mathematica}, pages = {1--6}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1967}, mrnumber = {0253166}, zbl = {0183.40402}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_114994/} }
Bumcrot, Robert J. Geometrical concepts in normed linear spaces. Portugaliae mathematica, Tome 26 (1967) no. 1, pp. 1-6. http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_114994/