@article{AM2_1982__25_136976,
     author = {J\"urg R\"atz},
     title = {On orthogonally additive mappings. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {317--318},
     publisher = {mathdoc},
     volume = {25},
     year = {1982},
     zbl = {0569.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1982__25_136976/}
}