@article{GDZPPN002350149, title = {A Note on a Problem of Busemann.}, journal = {Mathematica Scandinavica}, volume = {24}, year = {1969}, pages = {145-148}, zbl = {0189.22902}, url = {http://dml.mathdoc.fr/item/GDZPPN002350149} }
Giertz, M. A Note on a Problem of Busemann.. Mathematica Scandinavica, Tome 24 (1969) pp. 145-148. http://gdmltest.u-ga.fr/item/GDZPPN002350149/