@article{GDZPPN002040239,
title = {On a general principle in geometry that leads to functional equations.},
journal = {Aequationes mathematicae},
volume = {45},
year = {1993},
pages = {3-10},
zbl = {0788.39005},
url = {http://dml.mathdoc.fr/item/GDZPPN002040239}
}
Benz, Walter. On a general principle in geometry that leads to functional equations.. Aequationes mathematicae, Tome 45 (1993) pp. 3-10. http://gdmltest.u-ga.fr/item/GDZPPN002040239/