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@article{MZ_1966__91_170501, author = {G\"unter Ewald and Geoffrey C. Shephard}, title = {Normed vector spaces consisting of classes of convex sets.}, journal = {Mathematische Zeitschrift}, pages = {1--19}, publisher = {mathdoc}, volume = {91}, year = {1966}, zbl = {0141.39003}, url = {http://geodesic.mathdoc.fr/item/MZ_1966__91_170501/} }
Günter Ewald; Geoffrey C. Shephard. Normed vector spaces consisting of classes of convex sets.. Mathematische Zeitschrift, Tome 91 (1966), pp. 1-19. http://geodesic.mathdoc.fr/item/MZ_1966__91_170501/