@article{2504, author = {Bumcrot, Robert J.}, title = {Geometrical concepts in normed linear spaces}, journal = {Portugaliae mathematica}, volume = {26}, year = {1967}, pages = {1-6}, zbl = {0183.40402}, mrnumber = {0253166}, language = {en}, url = {http://dml.mathdoc.fr/item/2504} }
Bumcrot, Robert J. Geometrical concepts in normed linear spaces. Portugaliae mathematica, Tome 26 (1967) pp. 1-6. http://gdmltest.u-ga.fr/item/2504/