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@article{MS2_1969__25_166111, author = {M. Giertz}, title = {A {Note} on a {Problem} of {Busemann.}}, journal = {Mathematica Scandinavica}, pages = {145--148}, publisher = {mathdoc}, volume = {25}, year = {1969}, zbl = {0189.22902}, url = {http://geodesic.mathdoc.fr/item/MS2_1969__25_166111/} }
M. Giertz. A Note on a Problem of Busemann.. Mathematica Scandinavica, Tome 25 (1969), pp. 145-148. http://geodesic.mathdoc.fr/item/MS2_1969__25_166111/