@article{GDZPPN00208323X,
title = {Why Means in Two Arguments are Special.},
journal = {Elemente der Mathematik},
volume = {49},
year = {1994},
pages = {32-37},
zbl = {0860.26014},
url = {http://dml.mathdoc.fr/item/GDZPPN00208323X}
}
Lorenzen, Gunter. Why Means in Two Arguments are Special.. Elemente der Mathematik, Tome 49 (1994) pp. 32-37. http://gdmltest.u-ga.fr/item/GDZPPN00208323X/