@article{GDZPPN002040042, title = {Regular hexagons in normed spaces and a theorem of Walter Benz.}, journal = {Aequationes mathematicae}, volume = {45}, year = {1993}, pages = {163-166}, zbl = {0785.46014}, url = {http://dml.mathdoc.fr/item/GDZPPN002040042} }
Laugwitz, Detlef. Regular hexagons in normed spaces and a theorem of Walter Benz.. Aequationes mathematicae, Tome 45 (1993) pp. 163-166. http://gdmltest.u-ga.fr/item/GDZPPN002040042/