@article{ELMA_1994__49_1_141557,
     author = {Gunter Lorenzen},
     title = {Why {Means} in {Two} {Arguments} are {Special.}},
     journal = {Elemente der Mathematik},
     pages = {32--37},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1994},
     zbl = {0860.26014},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141557/}
}