@article{AM2_1985__28_137037,
     author = {J\"urg R\"atz},
     title = {On orthogonally additive mappings.},
     journal = {Aequationes mathematicae},
     pages = {35--49},
     publisher = {mathdoc},
     volume = {28},
     year = {1985},
     zbl = {0569.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1985__28_137037/}
}