@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/